I just programmed a plugin a scoreboard plugin what buggt:
GUCK the Hastebin on there's the ERROR and no CODE
Are you aware that I do not get much from a stack race? I'll just googling the bug, but I can just read, because it says that the class or the plugin is invalid, but you'll have seen for yourself.
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError