DFR3207E PDS DIRECTORY READ ERROR DDNAME=IMSACB`x`

Explanation
 An I/O error has occurred while reading the partitioned
data set directory of the data set IMSACBx (where x is
A or B).

System action
 The job ends with an abend code of U3207.

User response
 Check the DD statement for the ACB library of
the IMS to be recovered. Recover
the data set if necessary, and then rerun the job.