[Error Unzipping FIle]

I need help with my modpack named MetallicPack, When i try to install it I always get the message "Error Unzipping file" , I watched a video on how to make a modpack and did everything right. Here are the steps i did

1) Made 3 folders bin, configs, and mods

2) Put mods in mods

3) Put modpack.jar in bin

4) added all three folders to archive and made it a .zip

5) uploaded it to copy.com

6) uploaded it to technic

I really need help, I have been constantly trying to make this work but this is the only problem

[Error Unzipping File]

I need some help with my modpack MetallicPack. I have watched two videos on how to create a modpack and have 3 folders bin, mods, and configs. I have put modpack.jar in bin and put my mods in the mods folder. Then i added those three folders to the archive and made them a zip file. I then uploaded it to copy.com. I edited my created modpack, this problem is driving me crazy because i have done this like 3 times and no matter what I have gotten errors.

(I don't know if this fits in the Cafe Lame place, I am new here)