I know there is another question with exact the same problem, but I went trough all those answers, and none helped me. :( (This was the question.)
I just created a new A
Running this command in bash to delete all bins worked for me
$ find . -iname "bin" -o -iname "obj" | xargs rm -rf
Can't guarantee it'll work for anyone else though
Also be aware it'll delete all bin files -so you will have to rebuild all projects. Obviously best to cd into the relevant directory before using it.