When trying to edit the name, description or group of a Site Content type in MOSS 2007 B2 TR you receive the following error:

“The resource object with key 'cyptedit_select_group' was not found. “

This is caused by a missing resource string which you can add in manually.  Navigate to the wss virtual directories folder on your server, typically, C:\Inetpub\wwwroot\wss\VirtualDirectories.  Open the folder corresponding to your virtual server, e.g. 80, then App_GlobalResources.  Edit the file wss.resx in notepad and add another resource entry for the missing key at the end of the file.