Has anyone uncountered this before when adding a new property field with cascadind Data Type Standard ?

After adding a new alias to the docType and save all the changes i got this message.

NullReferenceException: Object reference not set to an instance of an object.]
   Dascoba.Umb.CascadingProperties.<>c__DisplayClass1f.<GetCascadingDataType>b__1e(ICascadingDataType cdt) +123
   System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source, Func`2 predicate) +172
   Dascoba.Umb.CascadingProperties.Helper.GetCascadingDataType(PropertyType propertyType) +199
   Dascoba.Umb.CascadingProperties.ContentTypeMapping.LoadConfiguration() +1641
   Dascoba.Umb.CascadingProperties.ContentTypeMapping..ctor(String contentTypeAlias) +72
   Dascoba.Umb.CascadingProperties.ApplicationEvents.HandleContentPage(Page contentPage) +535
   Dascoba.Umb.CascadingProperties.ApplicationEvents.umbracoPage_Load(Object sender, EventArgs e) +431
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3063

Both docType and Node display the same error message.

Any idea why ?