Plesk Migration fails: Failed to execute received command for function 'mkdir'

Symptoms

• Plesk fails to migrate a subscription

  Failed to copy web files for subscription 'example.com'.
  Migration tools tried to perform operation in 3 attempts: Failed to execute remote command on '203.0.113.2' server. Check debug log (usually at "%SYSTEMDRIVE%\plesk_migrator\rpc-agent\debug.log") for more details.

• These errors are logged to %SYSTEMDRIVE%plesk_migrator\rpc-agent\debug.log on the source server:

  [DEBUG] parallels | Create directory 'F:\plesk_migrator'
  [ERROR] parallels | Failed to execute received command for function 'mkdir'
  [DEBUG] parallels | Exception:
  Traceback (most recent call last):
  File "panel-migrator-rpc-agent.py", line 850, in handle
  File "panel-migrator-rpc-agent.py", line 458, in mkdir
  File "os.pyc", line 150, in makedirs
  File "os.pyc", line 157, in makedirs
  WindowsError: [Error 3] The system could not find the specified route 'F:\'

• The plesk_migrator directory exists on C:\

Cause

An incorrect temporary directory is configured in the current migration session.

Resolution

Start a new migration session with the right temporary directory.

1. Log in to Plesk on the destination server
2. Finish the current migration from Tools & Settings > Migration & Transfer > 203.0.113.2 with the Finish Migration button
3. Press Start a New Migration
4. Enter the source server's info, making sure that Temporary Directory has an existing path
5. Continue with the migration process