MCreator 1.8.3 for 1.7.10 mod

Hello, 

I just made a big 1.7.10 mod in MCreator 1.8.3. When I test it, everything is ok, but when I export it, MCreator export a mod, great, but when I put it in my .minecraft, the mod is empty, any items or blocks, just minecraft with nothing else..

So can you help me ? 

Thanks :) (and sorry for my english)