More information please. Does it happen with a specific project? Can you upload the project?
Works fine here with a project loaded from a USB stick. Maybe it fails to create some of the folders. This is not the best idea to develop directly from a USB stick as the compiler needs to create many files during compilation.
I would like to further investigate it with your help.
If you can please:
1. Download XUI Views library: https://www.b4x.com/android/forum/t...ss-platform-views-and-dialogs.100836/#content
2. Add a reference to the library.
Run the project in release mode and see whether the Files folder inside the APK is empty or not.
Second thing is to go to the build-tools folder:
Which folders do you see in your folder?