[01:31:34] [Server thread/WARN]: [Quests] Task #31 for Quests v1.8.1 generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R1/Packet
at me.blackvein.quests.NpcEffectThread.showEffect(NpcEffectThread.java:93) ~[?:?]
at me.blackvein.quests.NpcEffectThread.run(NpcEffectThread.java:34) ~[?:?]
at org.bukkit.craftbukkit.v1_7_R2.scheduler.CraftTask.run(CraftTask.java:58) ~[craftbukkit.jar:git-Spigot-1371]
at org.bukkit.craftbukkit.v1_7_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [craftbukkit.jar:git-Spigot-1371]
at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:618) [craftbukkit.jar:git-Spigot-1371]
at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:273) [craftbukkit.jar:git-Spigot-1371]
at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:566) [craftbukkit.jar:git-Spigot-1371]
at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:472) [craftbukkit.jar:git-Spigot-1371]
at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [craftbukkit.jar:git-Spigot-1371]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_7_R1.Packet
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:67) ~[craftbukkit.jar:git-Spigot-1371]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Spigot-1371]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_55]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_55]