Optional migration from Turris OS 3.x for advanced users

hi i just updated from the last Version from the 3 branche and everithing ist fine i just couldn’t get nextcloud to work. I have intalled it after the upgrade and switch to the hbs branche. The Problem seemse to be the creation of a Nextcloud username and password could you help me? is it possible to write it manueally in a file? Sorry i din’t know how i should get an log from the nextcloud the only massage is internal server error.

Thanks for your help.