Collabora does not work after NC Update

After an update of Nextcloud to version 21.0.4 Collabora online (version 4.2.2) does not work anymore. When I click on a document, first I get Pic-1 and after 20 sec I get a message that the document cannot be open. My provider told me that he has updated CODE Server to version 6.4.10.10.Pic-1