[HELP] Minecraft closes after 'Mojang' loading screen and technic launcher comes up again

[_Bobobot_]

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.

[plowmanplow]

Don't use Java 8. Remove version 8 and download the latest Java 7 JRE 64bit for your OS. Come back here and post a link to your pack page or API URL if you still have troubles.

[_Bobobot_]

Don't use Java 8. Remove version 8 and download the latest Java 7 JRE 64bit for your OS. Come back here and post a link to your pack page or API URL if you still have troubles.

 

Thanks for the response!

I installed Java 7, the same thing happens.

Here's my API URL: http://www.technicpack.net/api/modpack/sajtpack01

[plowmanplow]

• Your bin folder has too much stuff in it. The bin folder should only contain the modpack.jar file.
• Your Reika mods don't match. DragonAPI is much newer than GeoStrata.
• Your IC2 version is out of date and has known issues. This post should help:
• You have MicdoodleCore mod but neither of the other two Galacticraft mods. You either need to have all three or none of them.
• You have a fatal item ID conflict with the updated GeoStrata. It is safe to change all the item IDs in the config from 10000-10006 to 10700-10706.
• You have about 35 block ID conflicts with the updated GeoStrata. The client will generate an IDCOnflicts.txt file with specifics.
• You have two fatal block ID conflicts. The client will generate an IDConflicts.txt file with specifics.