You are getting an out of memory error. Increase your memory allocation. You are only allocating 1GB which is rarely enough for modded minecraft. I would recommend a minimum of 2GB but 4GB would be better, if you have enough available memory.I can try to get a copy of the log in a little bit but mod pack keeps crashing on me when loading up.
Based on the logs, it looks like it's having lots of issues placing angry zombies in the correct location? keeps throwing errors like that.. only angry zombies though.
Anyone know what's up?
crash log:
...snip...