Mac Help with BC4 and IC2

[Cosmology27]

I realize this isn't FTB specific, so if it's inappropriate to post here I understand. I've been using FTB for months now, and running a private FTB server. I got a little excited about 1.6.4, so I've been trying to mod out my own MC and server to accommodate it. I've got pretty much everything from FTB working (plus a few awesome extras), but the only thing I've really had a problem with is buildcraft 4 and industrialcraft 2. I've tried posting on the BC forums, but they're private or something (I can't even see where to sign up or login!). Just wondering if anyone here can help me.

I had IC2 installed and working fine on client and server, then I tried to install BC4, and it wouldn't get past the Mojang screen before giving me a problem. Here's the crash report. http://pastebin.com/99uwf8SU
I then deleted BC4, tried it again, and now IC2 is crashing it. Here's the crash report for that. http://pastebin.com/xMQ23w9g
For some reason installing BC4 made IC2 stop working. I deleted IC2, put it back in, and it still won't work. When I run it with BC4 and not IC2, it still crashes, so both of them are causing the client to crash. If neither are in the client, then it runs fine.

Any help at all would be appreciated.
Thanks!

 

[lavarthan]

IC2{1.118.401-lf} [IndustrialCraft 2] (industrialcraft-2_1.118.401-lf.jar)

IC2{1.118.401-lf} [IndustrialCraft 2] (industrialcraft-2-dev-deobf_1.118.401-lf.jar) Unloaded

When did you change the IC2 version? If you are looking for the latest version of IC2 I suggest using the experimental versions. Also note that in the second log you are using a mod developer version of IC2 which according to this is used for IC2 modding (addons). Notice the exact same error.

 

[Cosmology27]

Ahhhh so the problem came in when I changed IC2 versions, that makes sense. The reason was that I tried to put the new railcraft in, which required the experimental version of IC2. Thanks!
Now the problem, how do I cancel out whatever the old version did to the client? I mean, my removing the mod from the mods folder obviously didn't take away all references, so how do I fix it?
Thanks again!

 

[lavarthan]

Not sure what happened. It should have unless maybe you were using an older world. I would start from scratch with the world, mods and your configs if you can stomach the reset.