The meaning of the 1491 error status is:
There must be a DBNAME established before issuing a BIND RUN UNIT to the specified subschema.
A 1491 at startup indicates there is a problem with the DBTABLE.
Check the following:
The correct DMCL is being specified in the DMCL= PARM option of the JCL.
The name of the DBTABLE specified in the DMCL is correct.
Confirm the DBTABLE load module resides in the CDMSLIB concatenation.