problem with filtering in radgrid

[nguyen]

hello,

I have a radgrid with

 GridHyperLinkColumn gridHyperLinkColumn = new GridHyperLinkColumn();
gridHyperLinkColumn.AllowFiltering = true;
 gridHyperLinkColumn.CurrentFilterFunction = GridKnownFunction.Contains;
 gridHyperLinkColumn.ShowFilterIcon = false;
 gridHyperLinkColumn.AutoPostBackOnFilter = true;

But when i tested Filtering Function, the error occurred:

Sys$Enum$parse is not defined

parse()Teleri...98f28bc (line 8060)

b = "Contains"

a = undefined

filter()Teleri...98f28bc (line 7933)

h = "CaseId"

a = "216"

c = "Contains"

f = undefined

(?)()EditCa...seq/326 (line 2)

Telerik.Web.UI.GridFilterFunction.pars...")?b:Sys$Enum$parse.call(this,b,!!a);

 
I dont know this error, please help me fix this.
thanks,
hung

[Gabor]

I got the same error, but i did every step from the demo page.
Any help?