Can't get domain mapping to work

I have issues setting up domain mapping on a multisite installation. Can you help?!

This is the error message i get: https://www.dropbox.com/s/kerw64b7in6s18p/Schermafdruk%202016-07-13%2020.43.15.png?dl=0

I have setup the plugin. Entered the server IP. Checked sunrise in wp Config. Added sunrise.php in wpcontent folder. Checked if domain is resolving to this IP

There must be something i'm missing...just don't know what.