I have no idea what happened but after I installed the library from here https://www.b4x.com/android/forum/threads/vlcb4a-a-b4a-wrapper-of-vlc-android.64007/
And I ran the sample project. I can not run any other project. The device tells me that the package looks corrupted even though the compilng is going smoothly.
I do not know if this is related to the library but when I tried to remove all the applications that I created it I can not remove it. the pause and remove buttons (even after restart) and I can not remove it. And not run any other project.
Do you have an idea what to do?
Try to uninstall in your phone any app you have like "B4A Example" or something like that.
Sometimes you have differents apps with the same package name and I get this error.
Or change the package name of the app you are testing.