[Necro-Post]
That comes up quite a bit for me, but, it's not a bug, it's just a mess up.
Where you put the "game file" will dictate if that shows up, this is why I place all " Private Server" files in my DL section. It will never show up, as if it was somewhere else.
And, that "error" never effects game play, just click "close" on the "error report". It doesn't impede your game ;P.