iOS Question Cannot create Objects" because a file or directory with the same name.

Hello

I suddenly start geting this error while compiling:

Cannot create "C:\Users\tufan\Dropbox\Plaka iOS\Objects" because a file or directory with the same name already exists.

How can i fix this :/

ty

edit: I have deleted the objects file and tried again. it is ok now. But i dont now what happened