Exception of type 'System.Web.HttpUnhandledException' was thrown

Hi:
My website will send me an error report if there is any. I get this error messages quite often, but I don't know how that happens, it can comes from different pages, but when I open the page, seems working just fine, the site is hosted with Godaddy.com, looks like there is something wrong with "Temporary ASP.NET Files" in the C drive, but I don't think I can do anything on their C dirve (or can I?).

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Page location: /default.aspx

Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source: System.Web
Method: Boolean HandleError(System.Exception)
Stack Trace:
at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolea ...