_Bobobot_

Thanks for the response! I installed Java 7, the same thing happens. Here's my API URL: http://www.technicpack.net/api/modpack/sajtpack01

I tried to make a custom modpack, but it doesn't want to work. I did everything right (at least that's what I think), but when I start the modpack, minecraft loads up, I see the 'mojang' screen for a minute or so, and then Minecraft closes and I see the technic launcher again. The crash report says: There was a severe problem during mod loading that has caused the game to fail: cpw.mods.fml.common.LoaderException: java.lang.AbstractMethodError I have no idea what this means. Here's the full crash report: http://pastebin.com/rvhc780G I'd highly appreciate if someone could help me.