Error Caught in Page_Error event

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Error in: https://www.superkool.com.au/UI_KOOLVIEW/animal.aspx?asid=d2911b7c-2796-4168-8f33-58185f78ad3a&asid=d2911b7c-2796-4168-8f33-58185f78ad3a
Error Message: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).
Stack Trace:
at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException) at System.Guid.TryParseGuidWithDashes(String guidString, GuidResult& result) at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result) at System.Guid..ctor(String g) at Sapien.Kool.SuperKool.UI.UI_KOOLVIEW.Animal.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)