Due to any configuration issue if your server is generating errors, you can view the exact technical issue behind it by using debug mode. Debug mode is enabled by default and it will show the server side failure reason. For e.g.
When going in production mode, you should disable the debug mode by following config.
$g = new jqgrid(); $g->debug = 0;
In non-debug mode if your grid generates errors for some unfortunate reason, it will be display non-technical message to contact support team.