The current version for noobaa is the latest version i.e. 5.19.0
[root@new-12 s3-config]# cat system.json |jq

{{}

  *  *"new-14": {{}

    *    *"current_version": "5.19.0",{}

    *    *"config_dir_version": "1.0.0",{}

    *    *"upgrade_history": {{}

      *      *"successful_upgrades": []{}

    }{}

But while trying to upgrade the exisiting noobaa again with the latest version it is failing.  

[root@new-12 s3-config]# /usr/local/bin/noobaa-cli upgrade start --expected_version 5.19.0

{

  "error":

{     "code": "UpgradeFailed",     "message": "Upgrade request failed",     "cause": "Error: config_dir_version on system.json and config_fs.config_dir_version match, nothing to upgrade\n    at NCUpgradeManager.upgrade_config_dir (/usr/local/noobaa-core/src/upgrade/nc_upgrade_manager.js:115:19)\n    at async start_config_dir_upgrade (/usr/local/noobaa-core/src/manage_nsfs/upgrade.js:56:29)\n    at async Object.manage_upgrade_operations (/usr/local/noobaa-core/src/manage_nsfs/upgrade.js:24:13)\n    at async main (/usr/local/noobaa-core/src/cmd/manage_nsfs.js:91:13)"   }

}

Here in the error cause, it conveys that version is already upgraded, but still error code is "UpgradeFailed" 
"config_dir_version on system.json and config_fs.config_dir_version match, nothing to upgrade"