ICU020I synad message from VSAM while processing CKDS

Explanation
A physical I/O error occurred while the key manager
was attempting to read the cryptographic key data set (CKDS).

Operator response
Notify the system programmer.

System programmer response
See the explanation of the accompanying
VSAM physical I/O error message in your VSAM macro instruction book.
If the volume caused the error, use a backup copy of the CKDS on a
different volume. (If you do not want to re-IPL the system, ensure
that the new copy of the CKDS uses the same host master key as the
old copy.) If the device caused the error, move the volume containing
the CKDS to an alternate device. To change the volume or device, stop
the Cryptographic Unit Support (via IPL or an operator STOP command)
and restart it (via an operator START command), specifying an alternate
data set name on the START command, if required. Rerun the job.
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)

Routing code
2,9,10

Descriptor code
4