Issue issue /etc/cron.hourly/50plesk-hourly exited with return code 1

I would try to troubleshoot this by running each command from a /etc/cron.daily/50plesk-hourly file in the command line to determine which one is causing this message.
 
This looks like a database inconsistency to me.

Try to run plesk repair db and see if this fixes your issue.
More information about the Plesk repair tool: Plesk Repair Utility
 
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