Before i write anything, i already found this exact problem on the forums, but i'm unable to reply, and it's in a different version: http://www.minecraftforge.net/forum/index.php?topic=42478.msg225765#msg225765
Basically, i started up the game with the mod IC2(exact version industrialcraft-2-2.6.142-ex110), and when the game is on "Initializing Mods Phase 3" and while loading the mod, it crashes, and gives me a log. Note that i tested with no other mods, forge versions(1.10.2) 2185, 2205, 2151 and latest for 1.10.0. What is interesting is, that the log contradicts the game files. http://pastebin.com/5yQj9PpB
Short summary of the log:
The IC2 config file contains an invalid entry for balance/recyclerBlacklist.
Invalid value at line 63 (recyclerBlacklist = minecraft:glass_pane, minecraft:stick, minecraft:snowball, minecraft:snow_layer, minecraft:snow, IC2:blockScaffold).
There is no item matching IC2:blockScaffold.
If you look at this image http://i.imgur.com/l6TFxhy.png , you can see that it actually writes IC2:scaffold, NOT IC2:blockScaffold and i have went to the mods creators' forum, and they replied that everything about the mod is working properly.