Comment 1 for bug 1887163

It is an error to have two of the dns extensions enabled at the same time, only enable the one that has all the features that you need, in this case subnet_dns_publish_fixed_ip, this will include the dns extension automatically. I had the similar issue while developing the extenstion but after discussing with mlavalle about how this could be handled, the solution was to only have one of them active at a time.