Errors: Unknown Table ID & Field not formatted correctly.

I have Timeslips 2015 and a client has switched to LEDES1998B which I have used for another client.  I am getting the following error when I generate bills:

Unknown table ID. This database does not support the requested table.

Area: Table

Error Code: 1

Class: tTableExceptionC

Version: 23.0.0.177

Date: 4/26/2017

Time: 11:46:37 AM

Exception tTableExceptionC in module Timeslip.exe at 00151095.

Table:

Record: 0

Also, I ran a data verification and I have errors regarding the Field (Firm Matter ID) contains data that is incorrectly formatted.

Any help or suggestions is appreciated.