Your comments

I do exactly in the tutorial and set the UID,GID right too and still the web page of ubooquity returns error. 

I checked the logs , it's reading the metadata of PDF files , so it's working 

Also , there is an entry in logs 

"

[main] INFO com.ubooquity.b - Internal server started. Listening on port 2202 (library) and 2203 (admin)

"

server is started too, but the web interface is unreachable. So it's no use.

I'm not sure what is wrong, someone else must be having the same problems?

Thank you for the reply.

I tried those URL's  , those don't work either. 

For some reason, docker creates those errors. 

I both used the "add stack " in portainer, and template from " https://raw.githubusercontent.com/SelfhostedPro/selfhosted_templates/OMV5/Template/template.json " . The result is the same . 

There must be other who had the same problem?