0x004D0019 (5046297) The DB2 thread management exit returned a nonzero return code.

Explanation
A call to the DB2 Thread Management Exit program returned
a nonzero return code, which indicates an exit-specific problem. 

User response
Check the server log for the actual return
code that was issued by the exit. The return codes for the delivered sample
are documented in the CACSX07 source code that is found in the SCACSAMP library.
The name of the exit can be found in field 10 of the service information entry
for the DB2 CAF service.