Cant load the pack please help

[guyschurb43]

I am having a bit of a problem and could use some help. When I try to open the pack it downloads everything as it would normally then the launcher screen hides itself as if the pack was loaded then minecraft starts to open and just closes. I have tried many things and I just can't seem to fix it. I use mac and I am using the recommended builds for the pack so if anyone could help me it would be much appreciated.