jQuery Grid Plugin - jqGrid

Hi,

I'm using a jqGrid and I'm trying to have one of my columns be editable.  Some of my columns in the "colModel" looks like this:

1. {name:'First_Name',index:'First_Name', width:80,align:"center",editable:true},
   {name:'Last_Name',index:'Last_Name', width:100,align:"center",editable:true}

For some reason though when I click the cell, it doesn't allow me to edit it. 

I believe I have all the necessary js files as well, the css, the main jqGrid.min.js, and even the locale file.

Any help appreciated.

Regards.....