问颤振:错误:包io.flutter.embedding.engine.plugins不存在

EN

**> event sent after app closed: {id: 0, progressId: null, message: Running "flutter pub get" in play_big_win...}
event sent after app closed: {id: 0, progressId: null, finished: true}
Launching lib\main.dart on sdk gphone x86 in debug mode...
 lib\main.dart
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:14: error: package io.flutter.embedding.engine.plugins does not exist
import io.flutter.embedding.engine.plugins.FlutterPlugin;
                                          ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:15: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.MethodCall;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:16: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.MethodChannel;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:17: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.PluginRegistry;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:29: error: cannot find symbol
public class FlutterFirebaseCorePlugin implements FlutterPlugin, MethodChannel.MethodCallHandler {
                                                  ^
  symbol: class FlutterPlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:29: error: package MethodChannel does not exist
public class FlutterFirebaseCorePlugin implements FlutterPlugin, MethodChannel.MethodCallHandler {
                                                                              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:47: error: cannot find symbol
  private MethodChannel channel;
          ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:71: error: package PluginRegistry does not exist
  public static void registerWith(PluginRegistry.Registrar registrar) {
                                                ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:77: error: cannot find symbol
  public void onAttachedToEngine(FlutterPluginBinding binding) {
                                 ^
  symbol:   class FlutterPluginBinding
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:84: error: cannot find symbol
  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
                                            ^
  symbol:   class FlutterPluginBinding
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:223: error: cannot find symbol
  public void onMethodCall(MethodCall call, @NonNull final MethodChannel.Result result) {
                           ^
  symbol:   class MethodCall
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:223: error: package MethodChannel does not exist
  public void onMethodCall(MethodCall call, @NonNull final MethodChannel.Result result) {
                                                                        ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:72: error: cannot find symbol
    final MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL_NAME);
          ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:72: error: cannot find symbol
    final MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL_NAME);
                                      ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:76: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:79: error: cannot find symbol
    channel = new MethodChannel(binding.getBinaryMessenger(), CHANNEL_NAME);
                  ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:83: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:222: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:226: error: illegal start of type
    switch (call.method) {
           ^
19 errors
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':firebase_core:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 6m 45s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)**