only white space show up when using dhtmlxgrid with codeigni

Hello, I’m using codeigniter for this and I have follow this tutorials http://www.c236.com/tutorials__connector_codeigniter__step4.html

When I open the

file, grid interface is appear on the page
but if I use url to access them like

only white space shown up for me. So I have no idea how to make it works.

I have found it
calling .css and .js is different
thank you