Some web/assets folder files are empty

i have updated new verson of GXC-CMS but in new version some bootstrap and other files in assets folder are created empty.

i have followed :  https://docs.google.com/document/d/1EBDb7WpepBfwV6LjOfx-UdvcoVxQDSZARx_lZnnfe3E/edit.

i have also tried to give permissions to web/assets folder, but still getting same problem.

Kindly give suggesting.
