get the id of the current user using REST API

I want to get the ID of the current user using REST API : this is teh function :

 function ReturnIDUser(url) {
            //Url should be _spPageContextInfo.webAbsoluteUrl
            // var item = getListItems(url, listName, customquery, '', '');
            //ExecuteOrDelayUntilScriptLoaded(Start, "sp.js");
            var Result = null;

            $.ajax({

                url:url+"/_api/sp.userprofiles.peoplemanager/getmyproperties",
                type: "GET",
                headers: { "Accept": "application/json;odata=verbose" },
                success: function (data) {

                    Result = data.d;
                    ////get login name  
                    //var loginName = Result.LoginName.split('|')[1];
                    //alert(loginName);
                    ////get display name
                    //alert(Result.Title);
                    //

                },
                async: false,
                error: function (data) {
                    alert("failure");
                }
            });
            return Result.Id;
        }

but it's always : error , this is the error:

responseText    "{\"error\":{\"code\":\"-1, System.InvalidProgramException\",\"message\":{\"lang\":\"en-US\",\"value\"
            :\"Common Language Runtime detected an invalid program.\"},\"innererror\":{\"message\":\"Common Language Runtime detected an invalid program.
            \",\"type\":\"System.InvalidProgramException\",\"stacktrace\":\"   at Microsoft.Office.Server.UserProfiles.PeopleManager.GetMyProperties()\\r\\n 
            at Microsoft.Office.Server.UserProfiles.PeopleManagerServerStub.InvokeMethod(Object target, String methodName, ClientValueCollection xmlargs,
            ProxyContext proxyContext, Boolean& isVoid)\\r\\n   at Microsoft.SharePoint.Client.ServerStub.InvokeMethodWithMonitoredScope(Object target, String methodName, 
            ClientValueCollection args, ProxyContext proxyContext, Boolean& isVoid)\\r\\n 
            at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.InvokeMethod(Boolean mainRequestPath, Object value, ServerStub serverProxy, EdmParserNode node,
            Boolean resourceEndpoint, MethodInformation methodInfo, Boolean isExtensionMethod, Boolean isIndexerMethod)\\r\\n 
            at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.GetObjectFromPathMember(Boolean mainRequestPath, String path, Object value, EdmParserNode node,
            Boolean resourceEndpoint, MethodInformation& methodInfo)\\r\\n  
            at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.GetObjectFromPath(Boolean mainRequestPath, String path, String pathForErrorMessage)\\r\\n   at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.Process()\\r\\n   at Microsoft.SharePoint.Client.Rest.RestRequestProcessor.ProcessRequest()\\r\\n 
            at Microsoft.SharePoint.Client.Rest.RestService.ProcessQuery(Stream inputStream, IList`1 pendingDisposableContainer)\"}}}"