Nextcloud won't finde my Database

[LetiProgramming]

Hi, I'm a bit desperate here at the moment.
I have meticulously followed all the steps in the instructions.
I would now like to create the admin account, but somehow things are strange here.
First of all, the GUI doesn't load properly.
And although I have entered everything correctly, I end up on an error page.

Thats the error:

Does anyone have any idea what could be going wrong here?

[NiklasGruenewald]

i had to enter the root user and password to make it work

[ladral]

Hi @LetiProgramming

Do you have any unused virtual switches listed under the "Network and Virtual Switch" settings of your NAS? If so, please consider removing all unused switches (except for docker0) and then try recreating the Nextcloud app.