Why won't my Minecraft server work?

Answer 1

I created a working server on version 10.2 but my brother and his friends want it in 1.8 format. I deleted all the files and tried to set it up again with a 1.8 jar, but the server won't start. I did everything the same. The problem seems to come when I set the ip in the properties. Is my ip somehow causing a problem because of me using it on the previous server?