multiinv error

[13:14:37] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'multiinv' in plugin MultiInv v3.3.1
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[custom.jar:git-Spigot-13716d9-0e2396c]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[custom.jar:git-Spigot-13716d9-0e2396c]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:645) ~[custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [custom.jar:git-Spigot-13716d9-0e2396c]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_60]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_60]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [custom.jar:git-Spigot-13716d9-0e2396c]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [custom.jar:git-Spigot-13716d9-0e2396c]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_60]
Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer
	at uk.co.tggl.pluckerpluck.multiinv.command.MICommand.command(MICommand.java:166) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.MultiInv.onCommand(MultiInv.java:275) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[custom.jar:git-Spigot-13716d9-0e2396c]
	... 14 more