500 Error

Something has gone terribly wrong. We recommend trying again in a little awhile.

A potentially dangerous Request.Path value was detected from the client (&).

System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (&).
   at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()
   at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)