@Reptar yes. So i have to downgrade the OnlyOffice Plugin. This helped me: https://help.nextcloud.com/t/error-after-upgrading-app/126540/17 only the command on Step 5 isn't right. Maybe this is the right one: find ./onlyoffice -type d -exec chmod 0750 {} \; find ./onlyoffice -type f -exec chmod 0640 {} \;
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