Issue installing Collabora following official guide

Hi, i tried to install collabora into my nextcloud installation.
I followed the guide and have come to the point where i met an error:

its on the second part from i understand. When i try to make a new doc the file itself is made, but Collabor does not open it.

in the docker.log from var/logs is no entry at all (last one is from 2 days ago).
the logging from nextcloud throws the folowing debugging infos: (newest to oldest)

Debug no app in context Issuing token for USER file 43, version 0 owned by USER, path/to/file/file
Debug richdocuments Generating WOPI Token for file 43, version 0.
Info admin_audit File accessed: "path/to/file/file "
Debug no app in context Storing the discovery.xml to the cache.
Debug no app in context getDiscovery(): Getting discovery.xml from the cache.
Debug no app in context Storing the discovery.xml to the cache.
Debug no app in context getDiscovery(): Getting discovery.xml from the cache.
Error files Could not find resource file “/apps/files/js/jquery.iframe-transport.js”

apache log:
No protocol handler was valid for the URL /lool/ws/https://spdatabase.v22016023347031802.supersrv.de/index.php/apps/richdocuments/wopi/files/43. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule

Could it be the missing proxy_wstunnel mod?
I hope someone can help. i couldnt manage to find anything on google that helped me.

Debian Wheezy
Apache 2.2.20
PHP 5.5.38
mysql 5.5.50
Kernel 3.16
Nextcloud 10 (latest 9 version same behaviour and Errors)

Thanks for your Time patient reader
Esh