Gemonk

When I go into my server (which I started 3 days ago) it gives me an alert that says "could not connect to a default or fallback server io.netty.channel.abstractchannel$annotatedconnectexception" and it has been that way for about 30 hours. It will let me join for a few seconds and kick me out and give me that alert. I think this may be because I typed "/gamerule randomTickSpeed" and put an absurd number in there and after that the server crashed and hasn't been working since. Is there a way to fix this?