The Nextcloud "eurooffice 11.0.5" app does not connect to the "documentserver_community 0.4.0" app

The Nextcloud "eurooffice 11.0.5" app does not connect to the "documentserver_community 0.4.0" app

Dear developers, since I—as an "end user"—cannot determine whether the problem lies with the "eurooffice app" or the "documentserver_community app," I unfortunately have to report the issue in both repositories:

https://github.com/nextcloud/documentserver_community
https://github.com/Euro-Office/eurooffice-nextcloud

Details:
"Nextcloud Hub 26 Winter (33.0.8)" (native on Debian with Apache as the web server)
"documentserver_community 0.4.0" (Nextcloud App)
"eurooffice 11.0.5" (Nextcloud App) or "onlyoffice 10.1.2" (Nextcloud App) - only one enabled at a time

Works:
"onlyoffice 10.1.2" (the so-called "connector app"?) connects to "documentserver_community 0.4.0" without issues (URL like https://sub.domain.tld/apps/documentserver_community in the connector settings), and the office application works.

Does not work:
"eurooffice 11.0.5" (the other so-called "connector app"?) does NOT connect to "documentserver_community 0.4.0" (using the same URL like https://sub.domain.tld/apps/documentserver_community in the connector settings). The "Connector" settings interface displays:

Error connecting (Server error: GET https://sub.domain.tld/index.php/apps/documentserver_community/healthcheck resulted in a 500 Internal Server Error response:

In the logs, I find the following lines (excerpt), for example, around the time of the connection attempt:

“app”: “eurooffice”,
“method”: “PUT”,
“url”: “/index.php/apps/eurooffice/ajax/settings/address”,
“scriptName”: “/index.php”,
“message”: “healthcheckRequest on check error”,
“userAgent”: “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Safari/605.1.15”,
“version”: “33.0.9.1”,
“exception”: {
“Exception”: “GuzzleHttp\Exception\ServerException”,
“Message”: “Server error: GET https://sub.domain.tls/apps/documentserver_community/healthcheck resulted in a 500 Internal Server Error response:\n\n\n\t<hea (truncated…)\n”,
“Code”: 500,
“Trace”: [
{
“file”: “/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php”,
“line”: 72,
“function”: “create”,
“class”: “GuzzleHttp\Exception\RequestException”,
“type”: “::”,
“args”: [
“*** sensitive parameters replaced "
]

Or:

“message”: “Could not resolve OCA\DocumentServer\Controller\DocumentController! Class "OCA\Onlyoffice\AppConfig" does not exist”,

I ask that this be logged as an error or that I be given feedback on whom... ...I could/should otherwise report this error.

Regards
Yummiweb

Reproduce the connection from the eurooffice connector settings using the documented Nextcloud, documentserver_community, and eurooffice versions. Start with the /apps/documentserver_community/healthcheck endpoint and the reported OCA\DocumentServer\Controller\DocumentController and OCA\Onlyoffice\AppConfig errors. Done means eurooffice connects successfully without a 500 response, while onlyoffice continues to work.