Updating screen events: java.lang.OutOfMemoryError: Java heap space

The launcher told to me to go here.

Put the summary of the bug you're having here:
The game crashes to launcher as fast as I load my favorite resource pack, Sphax PureBDcraft 256x256 for MC 1.8 .

What I expected to happen was...:
I expected to see the game load the resource pack.

What actually happened was...:
Java ran out of memory.

Steps to Reproduce:
1. Stat game
2. Open resource pack menu.
3. Put in resource pack.