Getting errorJavaScript runtime error: Object doesn't support property or method 'jqGrid in MVC 3 using helpers

Getting errorJavaScript runtime error: Object doesn't support property or
method 'jqGrid in MVC 3 using helpers

I am trying to implement JqGrid in MVC3 using helpers, but all the time i
get a javascript error -*"JavaScript runtime error: Object doesn't support
property or method 'jqGrid'".*I also add reference of MVCJqgrid in my
project. Here is my code for Jqgrid in view :-
@(Html.Grid("AgentGrid")
.SetCaption("Agents")
.AddColumn(new
MvcJqGrid.Column("AgentId").SetLabel("Agent SSN"))
.AddColumn(new MvcJqGrid.Column("Name"))
.AddColumn(new MvcJqGrid.Column("Country"))
.AddColumn(new MvcJqGrid.Column("City"))
.AddColumn(new MvcJqGrid.Column("Title"))
.SetUrl(Url.Action("List", "Home"))
.SetAutoWidth(true)
.SetRowNum(10)
.SetViewRecords(true)
.SetPager("pager")
)
and here is my code of action in controller:-
public ActionResult List(GridSettings gridSettings)
{
DataContext db = new DataContext();
string Name = string.Empty;
string Country = string.Empty;
string City = string.Empty;
string Title = string.Empty;
if (gridSettings.IsSearch)
{
Name = gridSettings.Where.rules.Any(r => r.field ==
"Name") ?
gridSettings.Where.rules.FirstOrDefault(r =>
r.field == "Name").data : string.Empty;
Country = gridSettings.Where.rules.Any(r => r.field ==
"Country") ?
gridSettings.Where.rules.FirstOrDefault(r => r.field ==
"Country").data : string.Empty;
City = gridSettings.Where.rules.Any(r => r.field ==
"City") ?
gridSettings.Where.rules.FirstOrDefault(r => r.field ==
"City").data : string.Empty;
Title = gridSettings.Where.rules.Any(r => r.field ==
"Title") ?
gridSettings.Where.rules.FirstOrDefault(r => r.field ==
"Title").data : string.Empty;
}
var Agents = db.Agent.ToList();
int totalAgents = Agents.Count;
var jsonData = new
{
total = totalAgents / gridSettings.PageSize + 1,
page = gridSettings.PageIndex,
records = totalAgents,
rows = (
from c in Agents
select new
{
id = c.AgentId,
cell = new[]
{ c.AgentId.ToString(),
string.Format("{0} {1}", c.Name, c.Country),
c.City,
c.Title
}
}).ToArray()
};
return Json(jsonData, JsonRequestBehavior.AllowGet);
}
Please suggest me for resolve the issue !! Thanks in advance!!