SymptomsWhile attempting a migration from Helm 3 server following error is displayed:
"Error: No migration agents found. Data migration is not available. "
CauseMigration from Helm 3 is not available in your version of Parallels Plesk Panel.
ResolutionMigration procedure from Helm 3 / single server has been introduced in updates to Parallels Plesk Panel version 10.3 and is available in Parallels Plesk Panel version 10.4. Update your installation to either of that versions.
Additional information111820 -- How to migrate single-server Helm 3 to Plesk 10.3
112608 -- How to migrate Helm 3 to Plesk 10.4