DFS3467I ERROR READING MODSTAT DATA SET

Explanation
 An I/O error occurred while reading the MODSTAT
data set or the contents of the MODSTAT data set are invalid. The
error was encountered during initialization for a batch DBD type IMS region.

System action
 IMS terminates abnormally with abend
U821.

Programmer response
 Reconstruct the MODSTAT data set with the
corrected ddnames before executing the batch job.

Problem determination
 1, 3, 17