Payroll error (print cheque control)

We have a client that is getting an error message during the print cheques function in Payroll.  They are getting an error has occured during print cheques control.  The error returned was 1020 errupdateBKtran -20, plus another 3 similar messages for upding bank services.  They have exited the system and tried to do it again, but they are getting the same message.  Any ideas?