cant publish my boostrap page on github page

I published my website on Github page. for the second time. But error appears which I don't understand. I used bootstrap for my page, here is the error

"Your site is having problems building: A file was included in bootstrap-3.3.7/docs/components.html that is a symlink or does not exist in your _includes directory. For more information, see http://ift.tt/2qsY3l2."