KuroSpeed

I don't know where my problems are. When i try to install my modpack on my launcher, everything download correctly, but it stop when modpack.jar appear. The link is not the problem ( http://205.196.123.203/ki37ra293wog/5v5pclt7588ewyx/codecraft.zip ). I have followed every steps, (modpack.jar with only .class files) and i have properly compressed all four folders. If someone has the solution of this problem, i will be very thankful. (Sorry for my bad english, i am French )