Nginx Error when trying to view a deployed form

I am getting an error if I try to preview or open a deployed form. I have a self hosted instalment. If I take a look at the logs using

docker logs -f --since 60m kobo-docker_kobocat_1

I am getting:

nginx: [emerg] bind() to failed (98: Address already in use)

The server only contains the Kobotoolbox application and port 80 is been used by the same application. May you kindly assist.