[InvalidOperationException: Sequence contains more than one matching element]
System.Linq.Enumerable.Single(IEnumerable`1 source, Func`2 predicate) +338
ServiceStack.WebHost.Endpoints.Metadata.BaseMetadataHandler.ProcessOperations(HtmlTextWriter writer, IHttpRequest httpReq, IHttpResponse httpRes) +325
ServiceStack.WebHost.Endpoints.Support.HttpHandlerBase.ProcessRequest(HttpContext context) +47
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +3375
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +1361
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