问Android studio添加IM SDK依赖method not found: 'api()'？

Error:(53, 0) Gradle DSL method not found: 'api()'

Possible causes:<ul><li>The project 'AskNow' may be using a version of the Android Gradle plug-in that does not contain the method (e.g. 'testCompile' was added in 1.1.0).

<a href="fixGradleElements">Upgrade plugin to version 2.3.3 and sync project</a></li><li>The project 'AskNow' may be using a version of Gradle that does not contain the method.

<a href="open.wrapper.file">Open Gradle wrapper file</a></li><li>The build file may be missing a Gradle plugin.

<a href="apply.gradle.plugin">Apply Gradle plugin</a></li>