Can not create a staging site

I can not create a staging site for http://www.k*******l.com. After I click Create Staging Site,it says:

Oops, the sync to staging for www.k*******l.com has failed.

The first time I created staging it failed. I clicked Delete Staging Site. Then I try to create another one, but it failed too. It works when we reset the staging. But the issue happens at the time of creating the staging.