STOR command failed

@NoobieLolz, I can tell you this.

If you want help from anyone here (Including the Admin) you need to give us a better understanding of what is happening with FTP. For that, we need the error logs of FileZilla. It is a free and super popular software that can give us detailed info. Please install it, connect to your website, and read us the error message(s).

Oh, it could also be due to this: