Bukkit

What steps will reproduce the problem?
1.Running minecraft custom modpack Rise Of Avnycyn
2.Open empty plugins folder
3.Run Cauldron 1.7.10
4.Import Plugin
5.Plugin Enables however an exception happens whenever mobs/blocks are broken.

What version of the product are you using?
Latest version.

Do you have an error log of what happened?
Yes I do, I will provide the entire error log along with just the exception.

Please provide any additional information below.
My lead developer is looking into this issue to see if he can try and resolve it however he mentioned for me to open a support ticket with you to see if you know of an easy solution.

I understand I am running a modded version, however after a few hours of research I cannot seem to find a solution to this error.