Listen, when describing computer problems it's very important to say exactly what happens. I seriously doubt the error message displayed was just "Fatal Error : CRC". Actually I'm just assuming you meant it was an error message - you did not describe how the message was displayed. Was it a windows pop up? A message in the game? In the console? Did the game client crash? Did the dedicated server crash? Are you running the dedicated server and the client on the same machine?
By reading your post I cannot determine any of this.
if my add-ons folder doesn't lag out.
This is barely even a sentence. You've just taken some computer words that you know and mashed them together.
Try again.