The last OMNIScanner left the factory back in July 2005. We regret to say service and support ended July 2009. It's replaced by the Versiv familly of testers.
This may be just a software error that can be cleared by resetting the OMNIScanner. To reset the OMNIScanner, remove the AC and the battery for 15 seconds. This should clear the error.
If the error will not clear, the OMNIScanner is dead - sorry.