Hi

I have web application developed via ASP.NET. It is working fine, but recently some users reported they hit error as below when load the page (login page). It only happens in certain machine (IE 7/8). But working fine in Chrome/Safari. Any ideas? Thank you

Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; chromeframe/15.0.874.121; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MS-RTC LM 8; .NET4.0C; .NET4.0E)
Timestamp: Thu, 12 Jan 2012 09:14:52 UTC
Message: Object doesn't support this property or method
Line: 1818
Char: 3
Code: 0
URI: https://../FlexEA/DXR.axd?r=1_23
Message: 'ASPxClientLoadingPanel' is undefined
Line: 240
Char: 1
Code: 0
URI: https://../FlexEA/HRSuite/Forms/MainPage.aspx
Message: 'ASPxClientTimer' is undefined
Line: 251
Char: 1
Code: 0
URI: https://../FlexEA/HRSuite/Forms/MainPage.aspx
Message: 'WebForm_LoadingPanel' is undefined
Line: 58
Char: 78
Code: 0
URI: https://../FlexEA/HRSuite/Forms/MainPage.aspx