Container Issues cannot figure out why.

[MHPage12]

So I have created a new crafting block (I do not know if is works), but everytime I click on the block my game crashes and gives me an error along the lines of YourContainer cannot cast to net.minecraft.client.gui.GuiScreen

 

My Source: https://github.com/MHPage12/MechCraftSRC

Full Error Report: http://pastebin.com/Ev2wg5EA

 

Thanks in advance to any help.

[endershadow]

I helped him with this. this has been solved.