Nextcloud installation error


So i am trying to install Nextcloud on OMV5 via Docker but i keep getting errors, i have tried guides by Techdad, PcMac and DB Tech

but i get variation of this error message
“Nextcloud is not installed - only a limited number of commands are available There are no commands defined in the “config:system” namespace.”

Im not having any luck so far, can someone help please?