Symptoms
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On a Plesk for Linux server, the following error is shown on attempt to open the menu Tools & Settings > Backup Manager:
Error: no element found: line 1, column 0
Error: Exec format error in ps utility: command 'ps -p 31663 -o state' was failed
Error: database disk image is malformed
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Plesk administrator may get a similar email notification:
Server
Plesk entry point: https://example.com/
The following error occurred during the scheduled backup process:
no element found: line 1, column 0
Cause
The file with Plesk backup tasks is corrupted.
Resolution
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Connect to the server using SSH.
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Rename the corrupted file
tasks.db:
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On AlmaLinux/CentOS/RHEL/CloudLinux/Rocky Linux:
# mv /usr/local/psa/PMM/tasks/tasks.db{,.bkp}
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On Ubuntu and Debian:
# mv /opt/psa/PMM/tasks/tasks.db{,.bkp}