Backup Manager is not accessible: ImportError: No module named migration_handler_session

Created:

2016-11-16 13:07:22 UTC

Modified:

2017-04-24 11:57:10 UTC

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Backup Manager is not accessible: ImportError: No module named migration_handler_session

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

  1. When opening Tools & Settings > Backup Manager in Plesk, the following error message is displayed:

    Internal error: Failed to parse response. Reason: Failed to read data from stream Process output:

    Message Failed to parse response. Reason: Failed to read data from stream Process output:
    File PMMConnector.php
    Line 831
    Type PleskPMMResponseException
  2. Running PMMcli.exe binary in command line shows an error:

    "%plesk_bin%\\PMMcli.exe" --help
    Traceback (most recent call last):
    File "%plesk_bin%\\PMMcli-runner.py", line 14, in <module> import pmmcli
    File "%plesk_dir%\\admin\\share\\pmmcli\\pmmcli.py", line 20, in <module> import pmmcli_session
    File "%plesk_dir%\\admin\\share\\pmmcli\\pmmcli_session.py", line 15, in <module> import pmm_migration_handler
    File "%plesk_dir%\\admin\\share\\pmmcli\\pmm_migration_handler.py", line 14, in <module> import migration_handler
    File "%plesk_bin%\\migration_handler.py", line 16, in <module> ImportError: No module named migration_handler_session

Cause

Plesk Migrator is broken or not installed.

Resolution

Launch Plesk installer:

# plesk installer --console --show-hidden-components

If Plesk Migrator is not installed, then install it.

In other case, reinstall it.

Solution #2

Replace folder "%plesk_dir%\\admin\\share" from another server.

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