I have been trying to put together a modpack for Minecraft 1.6.2. After several rounds of trial and error, I was able to get Minecraft to load with 35 mods (even though there are more I wanted to include). Everything seemed fine until I tried to make it load up a world so that I could test out the mods. I was using Better World Generation 4 (v1.1.8) to make it load Biomes o' Plenty (v0.6.2) and Highlands (v2.1.2) together. I have no real idea what went wrong, but I do have the crash report in case someone else might be able to figure it out.