Failed to upgrade schema, error: “file does not exist

harbor 2.2 Demote to 2.1 when , harbor-core I can't get up

 /var/log/harbor,  core The log reports the following error

Failed to upgrade schema, error: "file does not exist

error: no migration found for version 51

  Access to information , because database Version inconsistency , Automatic degradation is not supported, resulting in

The official also said , Demotion not supported , You need to back up your data first

  solve ：

There are some manual modifications on the Internet db schema version, But it leads to dirty Methods , There is no attempt here ;

The simple way is , The original /data/database （ The default path ） Backup and empty , Then reinstall the lower version .