Someone please help every time I add a plugin and run my server i get this in the server command: Could not load 'plugins/FlatEarth.jar' in folder 'plugins' org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: Bad version number in .class file Someone explain why??? if possible get on skype and help me
What version of Bukkit are you trying ? Is FlatEarth compatible for said verson of Bukkit ? 2 things you should look into before asking for help.
some things: 1) check your java version with "java -version" 2) ask the developer what version of java he compiles with here is the doc for that error UnsupportedClassVersionError