Spigot 1.8.3
Quests v2.3.2

I get the following error when right-clicking

[Quests] Task #71 for Quests v2.3.2 generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R1/Packet
at me.blackvein.quests.NpcEffectThread.showEffect_1_8_R1(NpcEffectThread.java:246) ~[?:?]
at me.blackvein.quests.NpcEffectThread.showEffect(NpcEffectThread.java:68) ~[?:?]
at me.blackvein.quests.NpcEffectThread.run(NpcEffectThread.java:44) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftTask.run(CraftTask.java:71) ~[craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:718) [craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R1.Packet
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[craftbukkit.jar:git-Spigot-529ff99-2acb9e4]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
... 10 more

#54 its not for 1.8.3

ok the fix in #57 works, thanks

I was referring to Github ticket 54, which is this ticket. The fix in dev build 57 is included in Quests 2.3.3:
http://www.spigotmc.org/resources/quests.3711/update?update=17128