This message provides the cause of the failure in data definition name allocation. Message CDA3421 provides the name of the data set.
In the message text:
hexnum1 is the SVC99 error code. hexnum2 is the SVC99 information code.
Make sure the data set is properly allocated. If the error still persists, rerun the CDAHLASM utility with the VERBOSE option. Provide this information to the IBM service representative responsible for your installation.