ICU1035 synad message for non-VSAM

Explanation
An I/O error occurred while the key generator utility
program was processing the non-VSAM data set defined by the SYSMKDS
or SYSIN DD statement. The format and explanation of the message is
in the description of the SYNADAF macro in your VSAM macro instruction
book.

System action
Key generator utility processing ends.

Programmer response
See z/OS DFSMS Macro Instructions for Data Sets for
the explanation of the message. Correct the problem and rerun the
key generator utility program as follows. If the SETM or CHGM function
was requested and the host master key was not set (message ICU010I
was not issued), rerun the entire job. Otherwise, use this listing
to determine which control statements were processed successfully.
Then rerun the utility program using the CHGK function to process
the remaining control statements.
Notify the security administrator.
To
ensure that you have all the messages issued for this problem, specify
MSGLEVEL=(1,1) for the job.

Source
Cryptographic Unit Support Program (CUSP)