Migration via Plesk migrator fails: some files vanished before they could be transferred (code 24)

Symptoms

• Migration of example.com fails with error:

  PLESK_ERROR: Failed to copy web files for subscription 'example.com.in'
  Migration tools tried to perform operation in 3 attempts: Rsync failed to copy files from the source server 'source' (203.0.113.2) to target Plesk server:
  This could happen because of a network connection issue. Run migration for that subscription once more.

• Log C:\Program Files (x86)\Plesk\var\modules\panel-migrator\sessions\yyyy_mm_dd\debug.log contains:

  CONFIG_TEXT: =|2019-11-19_05:00:41,325|D|ST1|core.runners.base|example.com.in||stderr: file has vanished: "/example.com/httpdocs/सर्à¤" (in vhosts)
  =|2019-11-19_05:00:41,325|D|ST1|core.runners.base|example.com.in||rsync warning: some files vanished before they could be transferred (code 24) at main.c(1637) [generator=3.1.1]

Cause

Unreadable file names or filenames is too long.

Resolution

1. Login to Plesk on the source server.
2. Go to Domans > example.com > File Manager and rename सर्à¤ file.
3. Migrate example.com once again.

Alternatively, files can be transferred manually without renaming and the error can be ignored.