Bukkit

hii

[14:56:18] [Server thread/INFO]: Max633 issued server command: /spectate Gold_Gladiator
[14:56:18] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'spectate' in plugin Spectate v2.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-1482]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[spigot.jar:git-Spigot-1482]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726) ~[spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:999) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:830) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489) [spigot.jar:git-Spigot-1482]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1482]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_7_R1/entity/CraftPlayer
    at com.Chipmunk9998.Spectate.api.SpectateManager.setExperienceCooldown(SpectateManager.java:847) ~[?:?]
    at com.Chipmunk9998.Spectate.api.SpectateManager.startSpectating(SpectateManager.java:259) ~[?:?]
    at com.Chipmunk9998.Spectate.SpectateCommandExecutor.onCommand(SpectateCommandExecutor.java:324) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-1482]
    ... 13 more

thanks