Take note of the fact that I literally just downloaded this tool. This is pretty much the first screen I've seen, and it shows up every time I double click one of my servers or open a new one.
So... halp?
Ah okay I think I got it.
It gave that error when I tried opening my server and it said that the server wasn't running by default. So I pressed the start button next to and it said the server was running, and woo! It's working now.
I'll reply to this again if I encounter another error, but thanks for the help! You got my attention towards the solution, so that's great :D