Error Caught in Page_Error event

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Error in: https://superkool.sapiencloud.com.au/UI_KOOLVIEW/SaleAnimals.aspx?cti=0&t=wl&wid=A6
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.TryParseGuidWithNoStyle(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.SaleAnimals.Page_Load(Object sender, EventArgs e) in C:\kv\Kool\Source\SuperKool\WebSite\Sapien.Kool.SuperKool.UI\UI_KOOLVIEW\SaleAnimals.aspx.cs:line 120 at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)