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I am no developer.
I read that composer is only necessary for developing.
This message is telling, that a required file for the “Contacts” app is missing - only the path of the file contains the word “composer” because originally composer was used to manage the dependencies.
You have to restore the missing files - either by (re-)installing the affected apps or by restoring a backup of the last known working version.
Edit: you can also download the official ZIP file for Nextcloud and extract the files as neeed to the folder of your Nextcloud installation.
