DFR3205E NO ALLOCATION FOR DDNAME=IMSACB`x`

Explanation
 The IMSACBx DD statement (where x is
A or B) is missing from the execution JCL.

System action
 The job ends with a return code of 16.

User response
 Specify the correct IMSACBx DD statement for the ACB library used by the IMS to be recovered and rerun the job.