Spectate problems

21.07 12:10:05 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
21.07 12:10:05 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
21.07 12:10:05 [Server] INFO Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_5_R3.entity.CraftPlayer
21.07 12:10:05 [Server] INFO ... 15 more
21.07 12:10:05 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
21.07 12:10:05 [Server] INFO at com.Chipmunk9998.Spectate.SpectateCommandExecutor.onCommand(SpectateCommandExecutor.java:534)
21.07 12:10:05 [Server] INFO at com.Chipmunk9998.Spectate.SpectateAPI.spectateOn(SpectateAPI.java:68)
21.07 12:10:05 [Server] INFO at com.Chipmunk9998.Spectate.SpectateListener.setExperienceCooldown(SpectateListener.java:748)
21.07 12:10:05 [Server] INFO Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_5_R3/entity/CraftPlayer
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:118)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.Packet3Chat.handle(SourceFile:49)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:839)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.chat(PlayerConnection.java:882)
21.07 12:10:05 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.handleCommand(PlayerConnection.java:964)
21.07 12:10:05 [Server] INFO at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCommand(CraftServer.java:523)
21.07 12:10:05 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
21.07 12:10:05 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
21.07 12:10:05 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'spectate' in plugin Spectate v1.11.1