Minecraft crash- Rotary Macerator

    Hi guys i have a problem with a ic2 addon: advanced machines for minecraft 1.7.2
    When i wont to open gui in Rotary Macerator the minecraft was crashed i need help with tihis error because i want this mod i my mod pack for yt

    Well, if the block is from advanced machines, post in the right section.
    You'll get a better answer.