[06:49:35 ERROR]: Error occurred while enabling Murder v2.7.7 (Is it up to date?)
java.lang.NoClassDefFoundError: de/inventivegames/packetlistener/handler/PacketHandler
        at de.inventivegames.murder.Murder.onEnable(Murder.java:162) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:356) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:316) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:505) [spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]
Caused by: java.lang.ClassNotFoundException: de.inventivegames.packetlistener.handler.PacketHandler
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_101]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.8.jar:git-Spigot-550ebac-7019900]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
        ... 12 more