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Knowledge Base

Plesk Backup Manager doesn’t work when Seafile is installed on AlmaLinux: PleskPMMResponseException

 
almalinuxbackupbackup managerbackup restore migrationphp

Symptoms

  • Plesk is running on AlmaLinux, and Seafile is installed

  • 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.

  1. Log in over SSH

  2. Symlink Python 3.6 as the default Python binary:

    # mv /usr/bin/python3{.bak} && ln -s /usr/bin/python3.6 /usr/bin/python3

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