Interact Error

[21:14:11 ERROR]: Could not pass event PlayerInteractEvent to SpartanCraft v2.1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:210) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:462) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:728) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_67]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_67]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:672) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:628) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:536) [craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        at java.lang.Thread.run(Unknown Source) [?:1.7.0_67]
Caused by: java.lang.ClassCastException: org.bukkit.event.player.PlayerInteractEvent cannot be cast to org.bukkit.block.BlockState
        at me.Michael.SpartaCraft.Core.blockClickEvent(Core.java:4499) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor56.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[craftbukkit-1.8.8.jar:git-Bukkit-53fac9f]
        ... 17 more