我的Flutter应用程序甚至没有webview_flutter插件，但正在显示错误。Gradle构建失败。首先它告诉我将minSDkVersion设置为19。我做到了，但仍然出现错误。我之前有一个完全相同的代码和插件的不同项目正在运行相同的应用程序，但我不明白发生了什么。请帮帮我。
Launching lib\main.dart on Android SDK built for x86 in debug mode...
Running Gradle task 'assembleDebug'...
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\thumbnails-
1.0.1\android\src\main\java\com\asapjay\thumbnails\ThumbnailsPlugin.java uses or overrides a
deprecated API.
Note: Recompile with -Xlint:deprecation for details.
C:\flutter\.pub-cache\hosted\pub.dartlang.org\webview_flutter-
2.0.6\android\src\main\java\io\flutter\plugins\webviewflutter\InputAwareWebView.java:31: error:
cannot find symbol
private ThreadedInputConnectionProxyAdapterView proxyAdapterView;
^
symbol: class ThreadedInputConnectionProxyAdapterView
location: class InputAwareWebView
C:\flutter\.pub-cache\hosted\pub.dartlang.org\webview_flutter-
2.0.6\android\src\main\java\io\flutter\plugins\webviewflutter\InputAwareWebView.java:112: error:
cannot find symbol
new ThreadedInputConnectionProxyAdapterView(
^
symbol: class ThreadedInputConnectionProxyAdapterView
location: class InputAwareWebView
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
2 errors
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':webview_flutter: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 44s
Exception: Gradle task assembleDebug failed with exit code 1