Can't create account to get started docker!

I just installed everything with docker method but I can't create a root account or a normal account since I am also not sure wich it would create on the rigidtration page! On the register page I getting a error but the docker logs show nothing and in the maxun folder are no files created! I changed in the .env only both public urls from localhost to the device Ip adress! Everything else is the same as in the example!

I created the maxun folder as parent folder since I understood it that way that it has to be a parent folder!