error: duplicate value for resource 'attr/orientation' with config '' .aapt.v2.Aapt2Exception: Android resource compilation failed

I find the problem, it is a bug and I reported it to Google ( b.android.com ) & they answered

Yep, we are aware of this issue, it will be fixed in the next alpha release. this is the : issue link

.

So how to solve it: I faced the problem when updated to alpha3 version of library in build.gradle (Module) :

  implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3' 

Just downgrade it to lower version:

  implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2' 

and now it's ok.

The problem was the conflict between constraintlayout:2.0.0-alpha3 library and attrs.xml merging on compile time!

and for you it might be just conflicts between some other libraries ( just check last updated libraries )

It happens if you are you have migrate to Androidx and you add android.support library. Just try to find Androidx library for the android.support library you are using. For example. Change

implementation 'com.android.support:cardview-v7:28.0.0'

To

implementation 'androidx.cardview:cardview:1.0.0'