Build Failed in Android

[sptin]

Hi, after added flutter_app_badger iOS is working fine but Android encountered build failed with the following message:

Could not determine the dependencies of task ':flutter_app_badger:compileDebugAidl'.

Failed to find Platform SDK with path: platforms;android-29

Anyone has the same problem, any possible solution? Thank you.

[Megatronicus]

Launching lib\main.dart on sdk gphone64 x86 64 in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.

• What went wrong:
  A problem occurred configuring project ':flutter_app_badger'.

Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

 If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

• 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.
==============================================================================

2: Task failed with an exception.

• What went wrong:
  Failed to query the value of property 'buildFlowServiceProperty'.

Could not isolate value org.jetbrains.kotlin.gradle.plugin.statistics.BuildFlowService$Parameters_Decorated@51ca47de of type BuildFlowService.Parameters
A problem occurred configuring project ':flutter_app_badger'.
> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
> Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

       If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

• 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 3m 50s
Error: Gradle task assembleDebug failed with exit code 1