Cron messages in 5.1.0

since 5.1.0 upgrade I got these syslog messages each 5 minutes:

Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (/bin/sh: config_load: not found)
Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (/bin/sh: config_get: not found)
Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (sh: out of range)
Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (/bin/sh: config_load: not found)
Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (/bin/sh: config_get_bool: not found)
Aug 28 17:30:01 gw crond[16229]: (root) CMDOUT (Sentinel nikola not enabled)
Aug 28 17:30:01 gw crond[16227]: (root) CMDOUT (There is no message to send.)

any idea what causes that?

seems it’s caused by nikola