Thread:Project:Support desk/Can't delete image uploads. "Error deleting file: Could not create directory 'mwstore://local-backend/local-deleted/a/x/b'."/reply (5)

You may try creating the directory from the shell, directly, but as the webserver's account, using the  command.

If it succeeds, you may also set a debug log to see exactly the full path it's trying to access.