nmon_timestamp.dat missing errors

The following error appears intermittently for most AIX clients:

07-23-2018 09:53:54.743 -0400 ERROR ExecProcessor - message from "/opt/splunkforwarder/etc/apps/TA-metricator-for-nmon/bin/metricator_consumer.sh" /opt/splunkforwarder/var/log/metricator/var/nmon_repository/fifo1/nmon_timestamp.dat: No such file or directory

The nmon_timestamp.dat file is there though and the start time for the topas_nmon process coincides with the timestamp of the error