To resolve this issue follow the steps below:
1) Quit AppleShare File Server, AppleShare Admin, and AppleShare Print Server.
2) Move the Users and Groups file from the Preferences folder to the root level of the system folder.
3) Restart the computer.
4) Run Disk First Aid.
5) Run AppleShare Admin
6) Enter all information (such as the AppleShare serial number and the server's name).
NOTE: The server name must be exactly the same or access privileges may be lost. Also, the name field is case sensitive.
The usable data from the Users and Groups Data file moved in Step 2 should be imported into a new Users and Groups file.