Importing a project from Github failed - Cause: invalid type code:

Hallo
I am a total newbie in Gradle and want to compile some Github project in Android Studio 4.0.1
So I opened Android Studio and tried to import e.g. the tazapp.
After the project is downloaded I think Gradle start to build it (I don’t know that exactly, I didn’t choose it, it runs automatically).
The Build Window’s left side says: Cause: invalid type code: 17
and this is what I can read in the Build Window’s right side:

Download https://services.gradle.org/distributions/gradle-6.5-all.zip (145,77 MB)
Download https://services.gradle.org/distributions/gradle-6.5-all.zip finished succeeded, took 55 s 14 ms
Starting Gradle Daemon...
Gradle Daemon started in 2 s 89 ms

FAILURE: Build failed with an exception.

* Where:
Build file 'D:\Projekte\Android\taz\tazapp-android\tazapp\build.gradle' line: 76

* What went wrong:
A problem occurred evaluating project ':tazapp'.
> Failed to apply plugin [id 'com.akaita.android.easylauncher']
> Could not create plugin of type 'EasyLauncherPlugin'.
> java.lang.ExceptionInInitializerError (no error message)

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.GradleScriptException: A problem occurred evaluating project ':tazapp'.
at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:93)
at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.lambda$apply$0(DefaultScriptPluginFactory.java:133)
at ...
Caused by: org.gradle.api.internal.plugins.PluginApplicationException: Failed to apply plugin [id 'com.akaita.android.easylauncher']
at org.gradle.api.internal.plugins.DefaultPluginManager.doApply(DefaultPluginManager.java:167)
at ...
... 126 more
Caused by: org.gradle.api.plugins.PluginInstantiationException: Could not create plugin of type 'EasyLauncherPlugin'.
at org.gradle.api.internal.plugins.DefaultPluginManager.instantiatePlugin(DefaultPluginManager.java:82)
at ...
... 136 more
Caused by: java.lang.ExceptionInInitializerError
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
...
... 151 more
Caused by: java.lang.NullPointerException
at com.akaita.android.easylauncher.plugin.EasyLauncherPlugin.<clinit>(EasyLauncherPlugin.groovy:23)
... 159 more

* Get more help at https://help.gradle.org

BUILD FAILED in 2m 12s

I shortened it a bit, to make it readable and all those millions following Java errors (at org…) wont help I guess.

The EasyLauncherPlugin doesn’t mean anything to me, I didn’t install it. Is it from this project and just missing? I would have to import it separately?
First I thought this was an error only with this project, but I get very similar (invalid type code) errors with other projects I try to import from Github (e.g. FairEmail.git), so it seems to me, it is a general issue with my configuration.
A search here didn’t help me, the Cause: invalid type code: - Error seems to be not so typical.

Can anybody give me a hint, where I could search to solve this?

In fact, I don’t know about Gradle and I compiled previously (with Android Studio 3- or Eclipse) sometimes some projects without big problems.

Thanks.
frank

Windows 10 Pro 64-Bit with Android Studion 4.0.1