[15:56:10] [Client thread/WARN]: Couldn't process command: 'setblocks 17 13 15 7 13 11 glass'
java.lang.NullPointerException
	at net.minecraft.entity.player.EntityPlayer.sendCommandFeedback(EntityPlayer.java:2559) ~[EntityPlayer.class:?]
	at net.minecraft.command.ServerCommandManager.notifyListener(ServerCommandManager.java:124) ~[ServerCommandManager.class:?]
	at net.minecraft.command.CommandBase.notifyCommandListener(CommandBase.java:773) ~[CommandBase.class:?]
	at net.minecraft.command.CommandBase.notifyCommandListener(CommandBase.java:766) ~[CommandBase.class:?]
	at mod.commands.CommandSetBlocks.execute(CommandSetBlocks.java:184) ~[CommandSetBlocks.class:?]
	at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:108) [CommandHandler.class:?]
	at net.minecraftforge.client.ClientCommandHandler.executeCommand(ClientCommandHandler.java:97) [ClientCommandHandler.class:?]
	at net.minecraft.client.gui.GuiScreen.sendChatMessage(GuiScreen.java:476) [GuiScreen.class:?]
	at net.minecraft.client.gui.GuiScreen.sendChatMessage(GuiScreen.java:467) [GuiScreen.class:?]
	at net.minecraft.client.gui.GuiChat.keyTyped(GuiChat.java:129) [GuiChat.class:?]
	at net.minecraft.client.gui.GuiScreen.handleKeyboardInput(GuiScreen.java:643) [GuiScreen.class:?]
	at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:591) [GuiScreen.class:?]
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1797) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1118) [Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:406) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]
[15:56:11] [Server thread/INFO]: Player456 has just earned the achievement [Taking Inventory]
[15:56:11] [Client thread/INFO]: [CHAT] Player456 has just earned the achievement [Taking Inventory]