Error Caught in Page_Error event

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Error in: http://orderacknowledgement.vertiv.com/WebResource.axd?t=637636636420000000
Error Message: This is an invalid webresource request.
Method Name: Void System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext)
Line Number: 0
Stack Trace:
at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)