Error 500 while admin_ajax POST on Google Cloud while using Clone

Hey guys, I am trying to clone a site using Cloner hosted in google cloud, but I get internal error 500 when it's trying to POST on admin_ajax

https://www.dropbox.com/s/qswqzqyrkz4a4r2/Screenshot%202016-03-26%2011.01.11.png?dl=0

Could it be permissions issue?