Minecraft Not Enough Items

So basically I'm using about twenty 1.6.4 mods and all of them work fine except for Not Enough Items. None of the mods I'm using conflict--I know this because the mods I'm using came from a larger modpack and they all worked fine together.

I have Code Chicken Core installed with it, to make it run, but nothing.
Any ideas?

Added (1). Deleted META-inf.
Still not working:[

Liquid xp isn't either!

Added (2). [quote name='CaerMaster' timestamp='1392254447' post='28904052']
You haven't said a single thing about what versions they are. Are they all up to date? I'm using the current NEI release in 1.6.4 along with almost 90 other mods, and it works fine.
[/quote]

I have versions
NotEnoughItems 1.6.1.5
CodeChickenCore 0.9.0.6

The new versions link is down, so I don't know if these are what I need, but my friend is using these two and they are fine for him.

It depends on the computer and its dpeed if you download over50 mods then it might stop working and minecraft might crush so possibly you have too much mods and no more can go on

Make sure you have meta-inf deleted and restart your pc