[08:27:56 INFO]: Omniscimus issued server command: /ach
[08:27:56 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ach' in plugin Achievements v2.0.0-50
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_75]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_75]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot.jar:git-Spigot-d0d1d87-15e81cf]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_75]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/util/com/google/gson/Gson
        at nl.lolmewn.libs.mkremins.fanciful.FancyMessage.createChatPacket(FancyMessage.java:527) ~[?:?]
        at nl.lolmewn.libs.mkremins.fanciful.FancyMessage.send(FancyMessage.java:514) ~[?:?]
        at nl.lolmewn.libs.mkremins.fanciful.FancyMessage.send(FancyMessage.java:552) ~[?:?]
        at nl.lolmewn.achievements.CommandHandler.sendAchievements(CommandHandler.java:176) ~[?:?]
        at nl.lolmewn.achievements.CommandHandler.onCommand(CommandHandler.java:45) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-d0d1d87-15e81cf]
        ... 14 more