Error Download Custom Modpack

[tienthanh2929]

I has just make a modpack for my friends to play with , so here the problem , i can't even download it , it said : Error Downloading modpack 

- My modpack is in .zip file instead of RAR format

- I removed all ZIP file inside my modpack , so i can add it later

Here my URL of modpack , please help , i can't undertstand this , i have been tried to fix it 4 days. 

https://www.dropbox.com/s/5ee1rou7n3eqbj8/Modpack.zip?dl=1

I also try to replace www. to dl and dropbox to dropboxuser..blahblah , it' doesn't work

Sorry for my bad english