What happens with b4a, I had a project working very well today when compiling I get this ugly error that came out also in this thread, but that solution did not work for me.
you probably forget to add an resource. maybe a res-folder. Or a file in objects\res\ should have been marked as readonly and it isn´t so when compiling it is removed.
Without seeing your code it is hard to give any congrete answer. -best is to upload a project which shows the issue.