Crashing wen making a new world

[Moltakkk111]

Ok so I want to make a world and yesterday it worked fine (I disabled extrabiomes) But today I want to play with some extra biomes so I loaded extrabiomes in and wen I click generate new world it crashes.

Note: I'm using ultimate

Error log:
java.lang.NullPointerException
at com.github.AbrarSyed.SecretRooms.client.SecretKey.keyUp(SecretKey.java:47)
at cpw.mods.fml.client.registry.KeyBindingRegistry$KeyHandler.keyTick(KeyBindingRegistry.java:117)
at cpw.mods.fml.client.registry.KeyBindingRegistry$KeyHandler.tickEnd(KeyBindingRegistry.java:99)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:139)
at cpw.mods.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:368)
at net.minecraft.client.Minecraft.l(Minecraft.java:1914)
at net.minecraft.client.Minecraft.J(Minecraft.java:848)
at net.minecraft.client.Minecraft.run(Minecraft.java:773)
at java.lang.Thread.run(Thread.java:680)