I've been getting this error whenever I try to start-up my Multicraft daemon, which then tries to start my server. It is followed by a java reference and a message saying "perhaps there is already a server running on this port?" I do not have an IP in server.properties. I could really use some help on how to fix this issue. FIXED! SOLUTION: <<<<< If you have this error, type "top" in your Linux console. Check if you have any java processes, if you do, use a command to kill these java processes, and restart multicraft. .