Server problem

[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?

[_Tarna_]

Run the command /gamerule randomTickSpeed 3 in console while the server is online but make sure no one joins the server. And also make sure the command is exactly like that since the command is case sensitive. After running this command, then you can just join the server.