You may have had to exit CMS improperly, due to power outage or lockup, and you'll need to clean up some extra files before you can go back in.
Have everyone on the network exit out of CMS and Finance, then from the workstation that is giving the error message, click Start | Programs | CMS for Windows | Search for Extraneous Files | Yes.
and delete any files it finds.
NOTE: If you get a warning from Norton about a malicious script detected when performing this utility, click Authorize This Script | OK. This is not a malicious script, it's very benevolent!!
NOTE: If you get a message saying it can't find the SEARCH.JS script, this utility may have been previously deleted. You can do the search manually by clicking Start | Search or Find | Files or Folders. In the box where you can type what Files/Folders to look for, type: P*.NET, P*.LCK and Look In My Computer.
Delete any files it finds.