Jquery namesession error in IE 8

I got this error in some IE 8 browsers.

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; InfoPath.2; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E) Timestamp: Fri,开发者_开发技巧 11 Mar 2011 20:48:23 UTC

Message: 'JSON' is undefined Line: 6 Char: 3 Code: 0

Message: '$.namesession' is null or not an object Line: 53 Char: 2 Code: 0

You are probably using JSON.stringify somewhere in your code which is not part of jquery. It is natively built in modern browsers but this might not be your case. So make sure you include json2.js in your page as well.