Symptoms

1. Migration using Plesk Migrator tool fails with the error:

   [2016-08-18 00:47:45][ERROR] Failed to fetch basic information about resellers, clients and domains data from source servers
   Cause: Command execution failed on the source server 'source' (10.20.30.40) with non-zero exit code.
   command: cmd.exe /C ""C:\\Program Files (x86)\\Parallels\\PanelMigratorAgent\\WINAgentMng.exe" "--create-shallow-migration-dump""
   exit code: -1073741819
   stdout: 
   stderr: 
   Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
      at WINAgentMng.App.debugGetAgent()
      at WINAgentMng.App.Main(String[] args)
   

2. Source server has Plesk 8.1 installed.

Cause

According to Migration Guide Plesk Migrator tool supports migration from Plesk 8.6 and above. The behavior with unclear error in case of unsupported version of Plesk on source server has been submitted as an software issue #PMT-3017 .

Resolution

1. Upgrade source server to Plesk version which is supported by Plesk Migrator tool and continue with migration.

2. If upgrade to higher version is not possible then perform migration with "Custom Hosting > Plesk" scenario. For more details how to perform it check the following articles:

3. Migrating From a Linux Server With Custom Hosting

4. Migrating From a Windows Server With Custom Hosting