I'm trying to make a simple modpack and failing gloriously. I've never really been all that good with modding anyways. But I just wanted to make a fairly simple 1.7.10 pack with Pixelmon, MrCrayfish's Furniture Mod, Chisel, Carpenter's Blocks, Chisel2, and Rei's Minimap, all with Forge of course. I've followed the walkthroughs, take everything out of the forge jar and then put everything in it into a new jar called modpack.jar in RAR format, put it in the bin folder and put all my mods in the mods folder, zip it all up, put it in drop box, get the link and insert the link in the Create A Modpack thing. But even after all this it gives me the error saying "error unzipping a file for the following pack". What am I doing wrong? I just wanted to make a simple modpack.