Getting a weird errormessage.txt file download which contains JS error text when click on linkbutton

See more:

C#

VB

ASP

ASP.NET

Telerik

When i click on a link button from menu on my application somettimes it auto show popup for download a file which name is errormessage.txt and after opening it there is some text related to JavaScript. The errormessage.txt contains following text:

<script language=javascript >
function checkNonRenewals()
{
    if (document.all[0].name == 'NonRenewal')
    {
        document.all[0].value = '1';
    }
}
</script>
Query timeout expired

Any suggestion will be really helpful.