[02:51:15 ERROR]: Could not pass event InventoryOpenEvent to FastCraft v17
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[server.jar:git-Spigot-6d16e64-87b9f46]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-Spigot-6d16e64-87b9f46]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [server.jar:git-Spigot-6d16e64-87b9f46]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [server.jar:git-Spigot-6d16e64-87b9f46]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:728) [server.jar:git-Spigot-6d16e64-87b9f46]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:714) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.EntityPlayer.openTileEntity(EntityPlayer.java:636) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.BlockWorkbench.interact(SourceFile:29) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:496) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:736) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-6d16e64-87b9f46]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_79]
	at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_79]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [server.jar:git-Spigot-6d16e64-87b9f46]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [server.jar:git-Spigot-6d16e64-87b9f46]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
Caused by: java.lang.NoSuchMethodError: java.util.HashMap.getOrDefault(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
	at co.kepler.fastcraft.InventoryManager.checkIfTempDisabled(InventoryManager.java:108) ~[?:?]
	at co.kepler.fastcraft.InventoryManager.onInventoryOpen(InventoryManager.java:79) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-6d16e64-87b9f46]
	... 20 more