PlayerSnapshot error log

[19:29:46 INFO]: Sinuce issued server command: /ps search Clare_87
[19:29:46 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ps' in plugin PlayerSnapshot v0.7.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1043) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:880) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R3/NBTCompressedStreamTools
        at com.cyprias.PlayerSnapshot.Plugin.getDatWorld(Plugin.java:475) ~[?:?]
        at com.cyprias.PlayerSnapshot.commands.SearchCommand.execute(SearchCommand.java:135) ~[?:?]
        at com.cyprias.PlayerSnapshot.command.CommandManager.onCommand(CommandManager.java:73) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        ... 13 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_7_R3.NBTCompressedStreamTools
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_72]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_72]
        at com.cyprias.PlayerSnapshot.Plugin.getDatWorld(Plugin.java:475) ~[?:?]
        at com.cyprias.PlayerSnapshot.commands.SearchCommand.execute(SearchCommand.java:135) ~[?:?]
        at com.cyprias.PlayerSnapshot.command.CommandManager.onCommand(CommandManager.java:73) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
        ... 13 more