VerifyError

Instance started with command: "C:\Program Files\Java\jre7\bin\java.exe"  -Xmx3072m -Xms2048m -cp "C:\\Users\\Trey\\Minecraft\\MultiMC-4" -jar MultiMCLauncher.jar "C:\\Users\\Trey\\Minecraft\\MultiMC-4\\instances\\Doug & Fooling with Mods\\.minecraft\\" "Treyzania" "5b22c564be1850f29738bf04d3fe09d06750e5b1" "MultiMC: Doug & Fooling with Mods" "854x480"

Loading jars...
Loading URL: file:/C:/Users/Trey/Minecraft/MultiMC-4/instances/Doug%20&%20Fooling%20with%20Mods/.minecraft/bin/minecraft.jar
Loading URL: file:/C:/Users/Trey/Minecraft/MultiMC-4/instances/Doug%20&%20Fooling%20with%20Mods/.minecraft/bin/lwjgl.jar
Loading URL: file:/C:/Users/Trey/Minecraft/MultiMC-4/instances/Doug%20&%20Fooling%20with%20Mods/.minecraft/bin/lwjgl_util.jar
Loading URL: file:/C:/Users/Trey/Minecraft/MultiMC-4/instances/Doug%20&%20Fooling%20with%20Mods/.minecraft/bin/jinput.jar
Loading natives...
Exception in thread "main" java.lang.VerifyError: (class: net/minecraft/client/Minecraft, method: k signature: ()V) Incompatible argument to function
	at java.lang.Class.getDeclaredFields0(Native Method)
	at java.lang.Class.privateGetDeclaredFields(Unknown Source)
	at java.lang.Class.getDeclaredFields(Unknown Source)
	at MultiMCLauncher.main(MultiMCLauncher.java:100)
Instance closed its output 1.
Instance closed its output 0.
Instance exited with code 1.
Minecraft has crashed!