Symptoms
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Plesk is running on AlmaLinux, and Seafile is installed
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Backup Manager returns error 500:
Type PleskPMMResponseException
Message Failed to parse response. Reason: Failed to read data from stream Process output:
File PMMConnector.php
Line 795
Cause
Seafile installed Python 3.9, which isn't compatible with Plesk.
Resolution
Remove the link to Python 3.9 and link a compatible version.
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Log in over SSH
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Symlink Python 3.6 as the default Python binary:
# mv /usr/bin/python3{.bak} && ln -s /usr/bin/python3.6 /usr/bin/python3