EVO Using IN-A  usually when I search for an inventory part, scroll to the part number and hit enter I get....
 
Fatal Error- File: WBKLookup.SCR Line:648
You have tried to access a file that has not been previously opened or the file number value (FNUM) passed was O.
 
Followed by:
 
Fatal Errror File. ListG60.LIB Line 408
The field you are trying to use is unallocated. It may belong to a file that hasn't........
 
this locks the screen and I need to use the windows task manager to stop the TAS7 process and start again.
 
This is happening fairly often.
 
Any suggestions as to the cause?
 
Thank you for your help.
 
Tom