2.6.0 no work

[08:57:46] [Server thread/ERROR]: Could not load 'plugins/MythicMobs-2.6.0.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Cannot find main class `net.elseland.xikage.MythicMobs.MythicMobs'
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:66) ~[spigot-1.11.2.jar:git-Spigot-0b1090d-7fdc749]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot-1.11.2.jar:git-Spigot-0b1090d-7fdc749]
    at...