Thank you, this fixed my problem however I have encountered another one.
After I start it the lines of text show up, most starting with "[sEVERE]" and ending with "<Unknown Source>" which I don't think is good.
After a few seconds everything stops completely and nothing happens, the last thing it says is "at.net.minecraft.server.ThreadServerApplication.run<SourceFile:492>
I'm not sure what to do next. Any help is appreciated, thank you.