open:flutter-error [EL]

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# Flutter error

### Unable to instantiate activity 

- https://webnautes.tistory.com/1320

<code>
# build.gradle

android {
  ...
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}
</code>

### Could not read script '/Users/[User]/sdk/flutter/packages/flutter_tools/gradle/app_plugin_loader.gradle'

- https://stackoverflow.com/questions/61436827/error-fluttersdkpath-packages-flutter-tools-gradle-app-plugin-loader-gradle-w

```
$ rm android/settings.gradle
$ flutter create .
```


### The method 'map' was called on null

```dart
istProvices?.map((Provinces value) {
  return new DropdownMenuItem<Provinces>(
    value: value,
    child: new Text(value.name, style: new TextStyle(fontSize: 16.0),),
  );
})?.toList() ?? [],
```


### 'GL_EXT_shader_framebuffer_fetch' : extension is not supported

Yes, it's wrong only in android emulator.

* https://github.com/flutter/flutter/issues/34479