blocks|key|5246884|text|没关系，我在settings.gradle中更改了名称并进行了同步，然后将其更改回并再次同步，这次它莫名其妙地起了作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5246885|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

never mind, i changed the name in settings.gradle and synced and then changed it back and synced again and it inexplicably worked this time.

blocks|key|5247072|text|重新生成您的项目分级文件以通过gradle添加app模块|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5247073|在项目的根文件夹中，打开settings.gradle文件进行编辑。|ordered-list-item|5247074|从文件中剪切include+':app'行。|5247075|在Android上，单击File菜单，然后选择Sync+Project++with+Gradle+files。|5247076|同步之后，将回行include+':app'粘贴到settings.gradle文件中。|5247077|再次运行Sync+Project+with+Gradle+files+.|5247078|entityMap^0|N|3|0|C|F|0|6|E|0|C|4|N|V|0|8|E|P|F|0|4|U|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|I|3|J|5|H|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|K|3|L|5|H|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|O|3|P|5|H|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|R|$]]

<h2>Resync your project gradle files to add the <code>app</code> module through Gradle</h2>
<ol>
<li>In the root folder of your project, open the <code>settings.gradle</code> file for editing.
</li>
<li>Cut line <code>include ':app'</code> from the file.
</li>
<li>On Android Studio, click on the <code>File</code> Menu, and select <code>Sync Project with Gradle files</code>.
</li>
<li>After synchronisation, paste back line <code>include ':app'</code> to the <code>settings.gradle</code> file.
</li>
<li>Re-run <code>Sync Project with Gradle files</code> again.
</li>
</ol>

blocks|key|5247463|text|当您刚刚安装了新安卓工作室并导入一些项目时，也可能会出现此问题，在新的Android中只下载了最新的sdk+(例如，当前的最新版本为30)，如果您的项目target+sdk为29，则不会在run+configuring对话框中看到您的module。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|5247464|因此，请下载应用程序所针对的sdk，然后运行Sync+project+with+gradle+files。|5247465|​|5247466|📷|atomic|5247467|5247468|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/3c305be0a485719c7b13926184cba0d6.png|imageAlt^0|7|6|24|A|2M|F|39|6|0|M|U|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|D]|$9|12|A|13|B|D]|$9|14|A|15|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|16|8|@$9|17|A|18|B|D]]|E|@]|F|$]]|$1|I|3|J|5|6|7|19|8|@]|E|@]|F|$]]|$1|K|3|L|5|M|7|1A|8|@]|E|@$9|1B|A|1C|1|1D]]|F|$]]|$1|N|3|J|5|6|7|1E|8|@]|E|@]|F|$]]|$1|O|3|-4|5|6|7|1F|8|@]|E|@]|F|$]]]|P|$Q|$5|R|S|T|F|$U|V|W|-4]]]]

This issue also may happen when you just installed new Android studio and importing some project, in the new Android studio only the latest sdk is downloaded(for example currently the latest is 30) and if your project <code>target sdk</code> is 29 you will not see your <code>module</code> in <code>run configuring</code> dialog.
So download the sdk that your app is targeted, then run <code>Sync project with gradle files</code>.
<a href="https://i.stack.imgur.com/BWkQQ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BWkQQ.png" alt="enter image description here" /></a>

blocks|key|2917738|text|尝试删除项目目录中的app.iml并重新启动android|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2917739|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Try to delete the app.iml in your project directory and restart android studio

blocks|key|2917929|text|你有三种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2917930|Android菜单中的清洁项目|ordered-list-item|2917931|构建->清洁项目并使用构建->重建|offset|length|style|BOLD|2917932|删除settings.gradle中的所有模块|CODE|2917933|开放settings.gradle项目|unordered-list-item|2917934|删除include+':app'和其他模块|2917935|同步级|2917936|添加include+':app'和其他模块|2917937|再次同步级|2917938|删除gradle.properties中的所有代码|2917939|开放gradle.properties项目|2917940|删除所有代码
org.gradle.daemon=true
org.gradle.configureondemand=true
org.gradle.parallel=true
android.enableBuildCache=true|2917941|2917942|再次添加代码|2917943|2917944|entityMap^0|0|0|0|H|0|2|F|0|2|F|0|2|E|0|0|2|E|0|0|0|2|H|0|7|M|U|X|1S|O|2H|T|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1B|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|1C|8|@$G|1D|H|1E|I|J]]|9|@]|A|$]]|$1|K|3|L|5|D|7|1F|8|@$G|1G|H|1H|I|M]]|9|@]|A|$]]|$1|N|3|O|5|P|7|1I|8|@$G|1J|H|1K|I|M]]|9|@]|A|$]]|$1|Q|3|R|5|P|7|1L|8|@$G|1M|H|1N|I|M]]|9|@]|A|$]]|$1|S|3|T|5|P|7|1O|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1P|8|@$G|1Q|H|1R|I|M]]|9|@]|A|$]]|$1|W|3|X|5|P|7|1S|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1T|8|@]|9|@]|A|$]]|$1|10|3|11|5|P|7|1U|8|@$G|1V|H|1W|I|M]]|9|@]|A|$]]|$1|12|3|13|5|P|7|1X|8|@$G|1Y|H|1Z|I|M]|$G|20|H|21|I|M]|$G|22|H|23|I|M]|$G|24|H|25|I|M]]|9|@]|A|$]]|$1|14|3|T|5|P|7|26|8|@]|9|@]|A|$]]|$1|15|3|16|5|P|7|27|8|@]|9|@]|A|$]]|$1|17|3|X|5|P|7|28|8|@]|9|@]|A|$]]|$1|18|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|19|$]]

You have 3 ways:
<ol>
<li>Clean Project in Android Studio menu</li>
</ol>
Build -&gt; Clean Project and use Build -&gt; Rebuild
<hr />
<ol start="2">
<li>Remove all the modules in <code>settings.gradle</code></li>
</ol>
<ul>
<li>Open <code>settings.gradle</code> project</li>
<li>Remove <code>include ':app'</code> and other modules</li>
<li>Sync gradle</li>
<li>Add <code>include ':app'</code> and other modules</li>
<li>Sync gradle again</li>
</ul>
<hr />
<ol start="3">
<li>Remove all code in gradle.properties</li>
</ol>
<ul>
<li>Open <code>gradle.properties</code> project
</li>
<li>Remove all code
<code>org.gradle.daemon=true</code>
<code>org.gradle.configureondemand=true</code>
<code>org.gradle.parallel=true</code>
<code>android.enableBuildCache=true</code>
</li>
<li>Sync gradle
</li>
<li>Add code again
</li>
<li>Sync gradle again
</li>
</ul>

blocks|key|2421557|text|在我的例子中，现有的答案都不起作用(Android+3.5.0)。我不得不|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2421558|关闭所有android项目|ordered-list-item|2421559|从android向导中的最近项目中删除该项目。|2421560|重启android演播室|2421561|使用导入选项+(Import、Eclipse等)，而不是将现有项目作为项目打开。|offset|length|style|BOLD|2421562|使用gradle文件文件->同步项目|2421563|entityMap^0|0|0|0|0|2|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|W|8|@$K|X|L|Y|M|N]]|9|@]|A|$]]|$1|O|3|P|5|D|7|Z|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|R|$]]

None of the existing answers worked in my case (Android studio 3.5.0). I had to 

<ol>
<li>close all android studio projects</li>
<li>remove the project from the recent projects in android studio wizard</li>
<li>restart android studio</li>
<li>use import option (Import project- Gradle, Eclipse ADT, etc) instead of open an existing project AS project</li>
<li>File -> Sync project with gradle files</li>
</ol>

blocks|key|2917800|text|我意识到settings.gradle文件中缺少了下面一行|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2917801|include+':app'|code-block|syntax|javascript|2917802|确保包含":app“模块|2917803|entityMap^0|4|F|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

I realized following line was missing in <code>settings.gradle</code> file
<pre><code>include ':app'
</code></pre>
make sure you include &quot;:app&quot; module

blocks|key|2917810|text|我为此而挣扎，因为我正在开发一个库，并且时不时地想把它作为一个应用程序来运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2917811|在应用程序/build.gradle上，检查一下你是否有apply+plugin:+'com.android.application'而不是apply+plugin:+'com.android.library'。|offset|length|style|CODE|2917812|你也应该在app/build.gradle中找到这个：|2917813|defaultConfig+{
++++++++applicationId+"com.your_company.your_application"
++++++++...
}|code-block|syntax|javascript|2917814|最后运行Gradle同步。|2917815|entityMap^0|0|S|13|1Y|Z|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

I struggled with this because I'm developing a library, and every now and then want to run it as an application.
From app/build.gradle, check that you have <code>apply plugin: 'com.android.application'</code> instead of <code>apply plugin: 'com.android.library'</code>.
You should also have this in app/build.gradle:
<pre><code>defaultConfig {
 applicationId &quot;com.your_company.your_application&quot;
 ...
}
</code></pre>
Finally run Gradle sync.

blocks|key|2421402|text|如果您无法在项目目录中找到您的settings.gradle文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2421403|添加settings.gradle文件|ordered-list-item|2421404|在settings.gradle文件中添加“：app”|2421405|重建或同步项目|2421406|您的应用程序模块应该出现在您的配置文件。|2421407|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|O|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Q|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|L|$]]

If you can't find your settings.gradle file in your project directory

<ol>
<li>Add settings.gradle file</li>
<li>Add include ':app' inside the settings.gradle file</li>
<li>Rebuild or sync your project</li>
</ol>

Your app module should appear in your configuration file.

blocks|key|2917849|text|在AndroidStudio3.2.1上更新后，我遇到了同样的问题，我不得不重新导入项目，之后一切正常|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2917850|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same issue after update on Android Studio 3.2.1 I had to re-import project, after that everything works

blocks|key|2917902|text|检查您的build.gradle文件，确保使用apply+plugin:+'com.android.application'而不是apply+plugin:+'com.android.library'|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2917903|对我来说很管用|2917904|entityMap^0|4|C|N|13|1T|Z|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

check your <code>build.gradle</code> file and make sure that use <code>apply plugin: 'com.android.application'
</code> istead of 
<code>apply plugin: 'com.android.library'</code>

it worked for me

blocks|key|2918044|text|我想在我面临这个问题时添加一些更多的信息：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2918045|参考:来自@Eli的回答：|2918046|blockquote|2918047|裁剪行包含文件中的“:app”。|ordered-list-item|CODE|2918048|在Android上，单击File菜单，然后选择文件。|2918049|同步后，将“：app”粘贴到settings.gradle文件中。|2918050|再次使用Gradle文件重新运行同步项目。|2918051|因此，让我们按照说明并努力记住一件事，那就是在构建配置中显示了什么。确保您看到了配置app的名称，如下所示：|2918052|📷|atomic|2918053|如果你看到了其他的东西，那么@Eli+(最被接受的答案)提到的步骤将无法工作。|2918054|如果您在“运行/调试配置”(Run/Debug+Configurations)窗口中有不同的名称，且上面的流程不工作，请将配置名称更改为“”。|2918055|然后->点击，应用+->，然后Ok。|2918056|在此之后，以下是：|2918057|带有gradle文件的File->Sync项目(如果需要的话)。|2918058|现在检查一下这个问题将有希望得到解决。我曾经面对过这个问题，我认为这也会对其他人有所帮助。|2918059|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/b34a1325fe11b1bb965be87333a60cc6.png|imageAlt^0|0|L|0|0|0|A|4|0|0|0|0|16|3|0|0|1|0|0|0|E|1L|0|0|I|0|0|9|0|0|W|0|0|19|0^^$0|@$1|2|3|4|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|I|7|1N|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1O|8|@$9|1P|A|1Q|B|M]]|D|@]|E|$]]|$1|N|3|O|5|L|7|1R|8|@]|D|@]|E|$]]|$1|P|3|Q|5|L|7|1S|8|@]|D|@]|E|$]]|$1|R|3|S|5|L|7|1T|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1U|8|@$9|1V|A|1W|B|M]]|D|@]|E|$]]|$1|V|3|W|5|X|7|1X|8|@]|D|@$9|1Y|A|1Z|1|20]]|E|$]]|$1|Y|3|Z|5|6|7|21|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|22|8|@$9|23|A|24|B|C]]|D|@]|E|$]]|$1|12|3|13|5|I|7|25|8|@$9|26|A|27|B|C]]|D|@]|E|$]]|$1|14|3|15|5|6|7|28|8|@$9|29|A|2A|B|C]]|D|@]|E|$]]|$1|16|3|17|5|I|7|2B|8|@$9|2C|A|2D|B|C]]|D|@]|E|$]]|$1|18|3|19|5|6|7|2E|8|@$9|2F|A|2G|B|C]]|D|@]|E|$]]|$1|1A|3|-4|5|6|7|2H|8|@]|D|@]|E|$]]]|1B|$1C|$5|1D|1E|1F|E|$1G|1H|1I|-4]]]]

I would like to add some more information while I was facing this issue:
Ref: Answer from @Eli:
<blockquote>
<ol>
<li>Cut line include '<code>:app</code>' from the file.</li>
<li>On Android Studio, click on the File Menu, and select Sync Project
with Gradle files.</li>
<li>After synchronisation, paste back line include ':app' to the settings.gradle file.</li>
<li>Re-run Sync Project with Gradle files again.</li>
</ol>
</blockquote>
So, let's follow the instruction and try to keep one thing in mind, that what is showing in your build configuration. Make sure you are seeing the name of your configuration <code>app</code> like the image below: <a href="https://i.stack.imgur.com/Lurd5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lurd5.png" alt="enter image description here" /></a> 
If you are seeing anything else, then the steps mentioned by @Eli (the most accepted answer) will not work.
An alternative Solution
If you have a different name on the Run/Debug Configurations window and the above process is not working, please change the config name to '<code>app</code>'
<blockquote>
then -&gt; hit Apply -&gt; then Ok.
</blockquote>
After that follow this:-
<blockquote>
File-&gt;Sync project with gradle files (if needed).
</blockquote>
Now check the issue will be resolved hopefully. I have faced this issue and I think it might help others as well.

blocks|key|2917829|text|我必须选择“使用类路径的模块：”下拉选项，并选择我的模块。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2917830|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had to select "Use classpath of module:" drop down option and choose my module.

blocks|key|2918219|text|我试图用最新的安卓工作室打开一个旧的GitHub项目，这就是为什么会出现这个错误。我尝试了几乎所有的方式，在这篇文章中提到，但没有一个是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2918220|在我的例子中，我用我的最新项目更新我的Gradle版本，这个问题就解决了。使用最新的分级版本来解决这个问题。|2918221|​|2918222|📷|atomic|offset|length|2918223|2918224|2918225|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/80e5a078cad0f06d45fefe6081e6d2ac.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/f89ba45975cb9b2521f75eb3f4d485ad.png^0|0|0|0|0|1|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@$I|11|J|12|1|13]]|A|$]]|$1|K|3|G|5|H|7|14|8|@]|9|@$I|15|J|16|1|17]]|A|$]]|$1|L|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T|U|-4]]|V|$5|P|Q|R|A|$S|W|U|-4]]]]

I was trying to open an old GitHub project with the latest android studio that's why got this error. I tried almost all the way that mentions in this post but none of them is work.
In my case, I update my Gradle version with my latest project, and the issue resolved. Use your latest Gradle version to resolve the issue.
<a href="https://i.stack.imgur.com/NEHuc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NEHuc.png" alt="enter image description here" /></a>
<a href="https://i.stack.imgur.com/c8Cuo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c8Cuo.png" alt="enter image description here" /></a>

blocks|key|2421880|text|有时，项目不会加载sdk版本。因此，在build.gradle文件模块级别上手动将其更改为您自己的sdk版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2421881|compileSdkVersion+28|ordered-list-item|2421882|buildToolsVersion+"28.0.3“|2421883|targetSdkVersion+28|2421884|现在，重新同步您的项目。|2421885|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|O|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Q|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|L|$]]

Sometimes the project doesn't load your sdk version.
so manually change the this in your build.gradle file module level to your own sdk version
<ol>
<li>compileSdkVersion 28</li>
<li>buildToolsVersion &quot;28.0.3&quot;</li>
<li>targetSdkVersion 28</li>
</ol>
now re-sync the your project.

blocks|key|2422023|text|如果没有解决方案，那么请确保从正确的目录打开该项目。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2422024|例如，当我从app文件夹和根打开项目时|2422025|模块未指定|blockquote|2422026|错误，但是当我从todoapp打开它时，错误已经消失了。|2422027|​|2422028|📷|atomic|2422029|2422030|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/91f593e2f9a3cb84dea6864055ad8775.png|imageAlt^0|E|4|0|0|0|8|7|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|19|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1A|8|@]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|R|3|N|5|6|7|1E|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]]]

If no solution works then make sure that you opened the project from the right directory
For example, when I opened the project from app folder and from the root
I got
<blockquote>
Module not specified
</blockquote>
error, but when I opened it from todoapp the error had gone
<a href="https://i.stack.imgur.com/n9Pzt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/n9Pzt.png" alt="example" /></a>

blocks|key|2422077|text|检查minsdkversion、compilesdkversion和targetsdkversion，并确保在Android中安装了来自Tools+->+SDKManager的所有这些。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2422078|例如，如果目标minsdkversion为30，minsdkversion为28，请确保安装了28、29、30个sdk。|2422079|entityMap^0|1W|J|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

Check your minsdkversion, compilesdkversion and targetsdkversion and ensure that you installed all those from Tools -&gt; SDKManager in Android Studio.
e.g if your targetsdkversion is 30 and minsdkversion is 28, ensure that you installed 28, 29, 30 sdks.

blocks|key|5247099|text|从app+gradle中移除以下代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5247100|android{
++++defaultConfig.applicationId="com.storiebox"
}|code-block|syntax|javascript|5247101|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Remove from app gradle this code

<pre><code>android{
 defaultConfig.applicationId="com.storiebox"
}
</code></pre>

blocks|key|5247110|text|我们目前建议将演习定为3.3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5247111|这些设置在当前的3.3beta版本中工作，并对您的项目进行两个小的更改：|5247112|在build.gradle+(项目)中，将分级版本更改为3.3.0-rc02|5247113|在菜单中转到“文件->项目结构”。在这里，您可以将gradle版本更改为4.10.0|5247114|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

We are currently recommending AS 3.3 for exercises.

These settings will work in the current 3.3 beta version with two small changes to your project:

In build.gradle (Project), change gradle version to 3.3.0-rc02

In menu go to File -> Project Structure. There you can change the gradle version to 4.10.0

blocks|key|2918146|text|在我的例子中，当我添加片段时，我发现了这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2918147|当我打开THe应用程序build.gradle时，我在插件中看到了id("kotlin-android")这个插件。|offset|length|style|CODE|2918148|把它移开！|2918149|entityMap^0|0|B|C|X|K|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

in my case, when I added Fragment I git this error.
When I opened THe app <code>build.gradle</code> I saw <code>id(&quot;kotlin-android&quot;)</code> this plugin in plugins.
just remove it!

blocks|key|2918315|text|您可以清理项目并使缓存/重新启动失效。在此之后，您的项目可能会被修复。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2918316|这个解决方案对我有效。|2918317|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can clean your project and and invalidate caches / restart. After that your project might be fixed.
This solution works for me.

blocks|key|2918307|text|如果上面所有的解决方案都不起作用，那么就试试这个解决方案吧，因为在我的例子中，上面的解决方案都不起作用。我也面临着这个问题，经过5个小时的努力，我可以告诉你一个解决办法。如果您正在使用git克隆项目，我会建议您直接使用android克隆项目。对我起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2918308|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If all above solution doesn't work then do try this solution, because in my case none of the above solution were working.
I too was facing this problem and after 5 hour of hard work I am able to tell you a solution.
If you are cloning project using git the I would recommend you to directly clone project using android studio.
It worked for me.

blocks|key|2421718|text|运行这个应用程序，它将显示“Edit+Configuration”窗口。在Module下-选择应用程序(将是<no+module>+)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2421719|然后选择活动(在Launch+Options下)|2421720|​|2421721|📷|atomic|2421722|2421723|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/78d93e6a2f686439c1e7770d99ebcc98.png|imageAlt^0|E|I|11|6|1I|B|0|8|E|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|I|5|6|7|1B|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

Run the app, it will show '<code>Edit Configuration</code>' window.
Under <code>Module</code> - select the app (it would be <code>&lt;no module&gt;</code> ).
Then select the activity (under <code>Launch Options</code>)
<a href="https://i.stack.imgur.com/4FCeR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4FCeR.png" alt="enter image description here" /></a>

I am getting a 'Module not specified' error in my run config. I have no module showing in the drop down yet I can see my module no probs. The issue came about when I refactored my module name, changed the settings.gradle to new name.

Now when I go to project structure and select my module nothing shows in the screen, not even an error.

I'm not 100% sure, but the icon beside my module looks like a folder with a cup and not a folder with a phone.

My exact steps -

<ol>
<li>Open in Android view</li>
<li>Refactor directory name</li>
<li>refactor module name</li>
<li>change settings.gradle contents: name to new name</li>
</ol>

Android Studio Run/Debug configuration error: Module not specified

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我得到一个‘模块未指定’错误在我的运行配置。我没有模块显示在下拉，但我可以看到我的模块，没有问题。当我重构模块名、将settings.gradle更改为新名称时，问题就出现了。现在，当我进入项目结构并选择我的模块时，屏幕上没有显示任何内容，甚至没有出现错误。我不是百分之百确定，但是我的模块旁边的图标看起来像一个带杯子的文件夹，而不是一个带有手机的文件夹。我的脚步声-在Android视图中打开重构目

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