XF 2.2 Xenforo CLI update throws error, web browser update hangs

[stormcloud]

I run

php cmd.php xf:upgrade

and I get this output:

Current version: 2011270
Upgrade target: 2020671 (2.2.6 Patch 1)
Are you sure you want to continue with the upgrade? [y/n] y


In Upgrade.php line 119:

  Call to undefined method XF\Install\Upgrader::assertValidUpgradeSteps()


 In Upgrade.php line 119:

  Call to undefined method XF\Install\Upgrader::assertValidUpgradeSteps()

xf:upgrade [--skip-statistics]

I tried a manual update because the web updater hangs and eventually 5xxs. -- Now even trying to login at /install/ does the same

How do I fix this?

 

[BoostN]

Try to reupload the latest files, as it seems you might be missing some.