Upgraded to 4.15.1 and archive.php stopped working

So we’re using the https://domain.com/tracking/matomo/misc/cron/archive.php?token_auth=key-hidden-for-obv-reasons
method to generate reports every 10 minutes, well, we were but now it returns
Error: The method ‘runCronArchiving’ does not exist or is not available in the module ‘\Piwik\Plugins\CoreAdminHome\API’.

Suggestions desperately needed, I tried restoring the 4.1.4 code in place of the new code but it instantly brings a new error on Matomo in general due to it having been upgraded and the DB is formatted for 4.15.1 now

Hi @FrankWDWNT
Are you sure the full installation of 4.15.1 has been completely done? No missing or corrupted file?
Can you check also the Matomo System Check? (:gear: > Diagnostic > System Check)