Fatal error while loading application stylesheet: themes/night.css?1648734869496

Hi,

i got myself a vserver (Ubuntu 20.04), installed Apache/2.4.53 and MariaDB.
Then i cloned tt-rss (git clone httx://git.tt-rss.org/fox/tt-rss.git tt-rss) changed config.php file and after chmod some files i got a pop up in Firefox saying this:

Fatal error while loading application stylesheet: themes/night.css?1648734869496

Checking error messages in Firefox i saw following error:

The stylesheet httx://xxx.xxx.xxx.xxx/tt-rss/themes/night.css?1648732327380 was not loaded because its MIME type, “text/html”, is not “text/css”.
When i click the css file its opening.

And some warnings:

The script from “httx://xxx.xxx.xxx.xxx/tt-rss/js/form/ValidationMultiSelect.js?1648728529” was loaded even though its MIME type (“text/html”) is not a valid JavaScript MIME type.

I searched the web, found some posts, but all those solutions did not help me.
I am also pretty sure its not a bug in tt-rss, only a misconfig on my server.

Maybe someone knows what i did wrong, or could give me a hint?

I really would like to use tt-rss further. Had it running forever on a Synology, but after update to DSM7 its not working anymore. So i thought i try to go another route.

Thanks in advance!

Sven

ps:
When i open site in Chrome i get this:

Seems Chrome is using the light theme.

I found this thread but it did not solve my problem.

Ttrss not rendering properly, missing css

FYI: I set up Server new, and now it works.