Read my post more clearly, I am saying the Disable UPnP box should be checked if you want Blockland to use your forwarded ports.
Ah, sorry, midread.
I did that when I attempted it the first time.
I also had it disabled on my router too.
I have hit into another error.
Every time I attempt to bind the forwarded ports to my IP, this comes up:

While, as you can see, I don't have anything binded to anything;
