Minecraft exited with exitcode 255

[EthanCoy]

I have been trying to get this mod pack to work, but I am just not having any luck in the matter. If anyone could help me figure this out, it would be greatly appreciated.
Below is the log. Sorry for the lengthy one.

http://paste.ee/p/JfOO6

[dmodoomsirius]

From what i can gather cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: chylex.hee.HardcoreEnderExpansion

Hardcore Ender Expansion is your issue.

[02JanDal]

I don't think that's the issue; Caused by: java.lang.UnsupportedClassVersionError: chylex/hee/HardcoreEnderExpansion : Unsupported major.minor version 51.0. You seem to be using Java 6, try upgrading to Java 8.

[EthanCoy]

I'm fairly decent with computer work, unless it's application use. You mean to upgrade my computer version of Java right, not the java used in MultiMC?

Thanks for the help though!

[02JanDal]

If you have java 8 installed already you can tell MultiMC to use that by going into the settings and changing it, otherwise you'll need to install it.

[EthanCoy]

I do have the current version of Java, and I am assuming it's selcted in the settings, but I am still having the same issue.

[dmodoomsirius]

if its loading java 6 then you are telling it to do so under settings, java, java path.

[EthanCoy]

I figured it out in the settings. 1.8 version wasn't showing up at first, only 1.6 was visable. Testing it out now. Thank you.

[peterix]

I assume it worked. Closing :)

[EthanCoy]

I have been at work so I couldn't focus on it. I still cannot get it to work. Here is the updated log, the core loads and never gets past 56%

http://paste.ee/p/MWPOk

[EthanCoy]

Also, I have several different versions installed, for different mods. The ones on 1.6.4, that game will not load. It starts to open up, but just eventually closes out instead of opening the game. Would that one have to run java 6?

[EthanCoy]

It seems to be a different problem that I cannot find a solution to. If anyone could help, that would be greatly appreciated. The error is "java.lang.OutOfMemoryError: GC overhead limit exceeded"

[peterix]

Well, then give the thing more memory.

[EthanCoy]

I'm not sure how to do that..