If I use a vanilla item on a recipe, my mod crash

[SkiFire13]

I want to create a private mod (1.7.10), that add some recipes of the mods Equivalent Exchange 3 and EMC Condenser (http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2104626-latvianmodders-mods-emc-condenser-elemite-coinsmod).

 

I create successfully the recipes of mod Equivalent Excharge 3, because I don't use a vanilla item (tested).

For the mod EMC Condenser I have to use a vanilla items (obsidian), but if I use it minecraft crash.

 

My mod on github (for help with the code): https://github.com/SkiFire13/EMCRecipe

The Crash Report: http://pastebin.com/MhmfPkV7

The flm-client log: http://pastebin.com/8WuVYXWs

 

Other information:

I use MultiMC for test my mod.

I used these guides:

https://www.minecraft-italia.it/forum/t-guida-come-creare-una-mod (I'm italian)

http://minecraft.gamepedia.com/Mods/Creating_mods/Adding_a_recipe (I think this guide is for minecraft 1.6, because use Block.nameblock. On 1.7 I must use Blocks.nameblock)

http://www.minecraftforge.net/wiki/Crafting_and_Smelting#Shaped_Crafting

 

Thanks for help

 

Ps. I'm italian, sorry for my bad english D:

[SkiFire13]

How can I do this?

 

I'm export the mod when it hasn't the vanilla item and it works, I can use the recipe.

[larsgerrits]

You can run it because the other mods' items aren't getting obfuscated. To build it properly, run

gradlew build

from the command line.

[SkiFire13]

Ok, but I import other mods, for use their Items. How can I esport only my mod?

[SkiFire13]

Ok, I have to recreate the project, but I can do this