Plesk Migrator migration from cPanel to Plesk server fails with error: That is a critical error, migration was stopped

Symptoms

• Plesk Migrator migration from cPanel to Plesk server fails with an error that is similar to the following:

  PLESK_ERROR: Failed to perform action: Fetch data from source cPanel
  Cause: Error creating migration dump: Command execution failed on the source server 'cpanel' (203.0.113.2) with non-zero exit code.
  command: cd /root/plesk_migrator/plesk_migrator-hqjcddtzrl9uc8rne9j8baq4tsk4tl39/pmm_agent; /usr/bin/perl createDump.pl --dump-domains=example.com --dump-clients=user --configuration-only --server -v 5 > dump.log 2>&1
  exit code: 2
  stdout:
  stderr: stdin: is not a tty
  That is a critical error, migration was stopped.

  PLESK_ERROR: Failed to perform action: Fetch data from source cPanel
  Cause: Error creating migration dump: Command execution failed on the source server 'cpanel' (203.0.113.3) with non-zero exit code.
  command: cd /root/plesk_migrator/plesk_migrator-xmigy6fud6m2zy4rtqxvg2ftety51kkk/pmm_agent; /usr/bin/perl createDump.pl --dump-domains=example.com --configuration-only --server -v 5 > dump.log 2>&1
  exit code: 2
  stdout:
  stderr:
  That is a critical error, migration was stopped.

• An error that is similar to the following can be found in a log file such as /usr/local/psa/var/modules/panel-migrator/sessions/20250602123245/pmm-agent.2025.XX.XX.X.X.X/configuration-dump.log:

  CONFIG_TEXT: [31655]: 2025-06-02 13:25:10 DEBUG FileFinder: mariadb resolved to
  'undef' value passed to XmlNode::setAttribute for 'version' at XmlNode.pm line 110.
  at XmlNode.pm line 110.
  XmlNode::setAttribute('XmlNode=HASH(0x359d560)', 'version', undef) called at Dumper.pm line 1190
  Dumper::addMySQLDatabases('XmlNode=HASH(0x23975e0)', 'example.com') called at Dumper.pm line 1124
  Dumper::addDatabases('XmlNode=HASH(0x23975e0)', 'example.') called at Dumper.pm line 997
  Dumper::makeDomainNode('example.com', 'example', undef) called at Dumper.pm line 743
  Dumper::makeAccountNode('example', undef, undef, undef) called at Transformer.pm line 488
  Transformer::getClientNode4Domain('example.com') called at Agent.pm line 117
  Agent::getDomain('example.com', 'recursive', undef, undef, 'HASH(0x3081f80)') called at DumpComposer.pm line 395
  DumpComposer::makeDomainNode('example.com', 1, undef, undef, undef) called at Dumper.pm line 2453
  Dumper::getDomainsNode('example', 'ARRAY(0x3124ec0)', 1, undef, undef, undef) called at Dumper.pm line 2402
  Dumper::getClientsNode('server', 'ARRAY(0x3124f08)', 'ARRAY(0x3124ec0)', 1, undef, undef, undef) called at Dumper.pm line 2335
  Dumper::getResellersNode('ARRAY(0x3124f20)', 'ARRAY(0x3124f08)', 'ARRAY(0x3124ec0)', 1, undef, undef, undef) called at Dumper.pm line 2276
  Dumper::makeDump('/root/plesk_migrator/plesk_migrator-we9f5sk08txwjs1masvraanti...', 'ARRAY(0x3124f20)', 'ARRAY(0x3124f08)', 'ARRAY(0x3124ec0)', 1, undef, undef, undef) called at createDump.pl line 132
  main::main() called at createDump.pl line 172

  CONFIG_TEXT: DEBUG Cannot connect to postgresql
  [2436743]: 2025-06-02 10:34:52 DEBUG Connection to postgresql is not valid
  Can't use string ("0") as a HASH ref while "strict refs" in use at Dumper.pm line 1229.
  at Dumper.pm line 1229.
  Dumper::getMysqlDataDir(0) called at Dumper.pm line 1180
  Dumper::addMySQLDatabases('XmlNode=HASH(0x273e2d0)', 'user') called at Dumper.pm line 1124
  Dumper::addDatabases('XmlNode=HASH(0x273e2d0)', 'user') called at Dumper.pm line 997
  Dumper::makeDomainNode('example.com', 'user', undef) called at Dumper.pm line 743
  Dumper::makeAccountNode('user', undef, undef, undef) called at Transformer.pm line 488
  Transformer::getClientNode4Domain('example.com') called at Agent.pm line 117
  Agent::getDomain('example.com', 'recursive', undef, undef, 'HASH(0x1d72ea0)') called at DumpComposer.pm line 395
  DumpComposer::makeDomainNode('example.com', 1, undef, undef, undef) called at Dumper.pm line 2453
  Dumper::getDomainsNode('user', 'ARRAY(0x1e14780)', 1, undef, undef, undef) called at Dumper.pm line 2402
  Dumper::getClientsNode(undef, 'ARRAY(0x1e147c8)', 'ARRAY(0x1e14780)', 1, undef, undef, undef) called at Dumper.pm line 2280
  Dumper::makeDump('/root/plesk_migrator/plesk_migrator-wht6d5617hx3pkdkg9yoy0ejl...', 'ARRAY(0x1e145b8)', 'ARRAY(0x1e147c8)', 'ARRAY(0x1e14780)', 1, undef, undef, undef) called at createDump.pl line 132
  main::main() called at createDump.pl line 172

Cause

The issue is caused by a known Plesk Migrator bug with ID #PMT-5599, which will be resolved in future versions of Plesk and Plesk Migrator extension.

Progress related to the bug can be tracked in the Change Log for Plesk Obsidian

Note: please click the Follow button near the article headline to stay informed - you will receive an update via email when the bug is fixed

Resolution

Until the bug is resolved permanently, you may execute the following workaround:

1. Log into your destination Plesk server
2. Create backups of the following files that are currently located on the server:

/usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_17_0_pmm_shared/CommonConfig.pm
/usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_12_5_pmm_shared/CommonConfig.pm
/usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_11_5_pmm_shared/CommonConfig.pm
/usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/core/connections/source_server.py

/opt/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_17_0_pmm_shared/CommonConfig.pm
/opt/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_12_5_pmm_shared/CommonConfig.pm
/opt/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_11_5_pmm_shared/CommonConfig.pm
/opt/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/core/connections/source_server.py