DFS822I NO ALLOCATION FOR DDN 'IMSACBx' IN (CTL|DLS) ADDRESS SPACE.
Explanation
The ACBLIB data sets must be defined in the JCL used to start IMS. The DDNAMEs used to define
ACBLIB are IMSACBA and IMSACBB. x is either A or B, indicating the missing
JCL DD statement. DLS is included in this message if the error was detected in
the DL/I subordinate address space. In a DL/I subordinate address space environment, both the
control region and JCL must define ACBLIB.
System action
IMS terminates with abend 0071 or 0821.
Programmer response
Check the JCL to ensure proper allocation per the IMS system definition information.