We need more information.  Exactly what are you doing when you get the message?  Can you predictably repeat it or is it random?

I see this error alot, and usually it means there are two processes of evoerp.exe running on the system. If you look in task manager in windows it will list how many are running. If you end both and start evo back up, the error goes away usually. It seems to be an issue with windows being closed in the wrong order, though I don't remember which ones.