Repo sync failed

I am using Colibri iMX6DL 512MB with colibri evaluation board v3.2 and i have tried to build a linux image using yocto project. I have followed the same steps as provided in this webinar and i while using repo sync, it takes to much of time and it comes till 90% and then it doesn’t work.
I am using Ubuntu 16.04 for my development PC.

And what exact hardware (module and carrier board) and software versions of things are you talking about? If something indeed does not work please do provide full textual log files thereof so we may actually look at it attempting to help you.