Closed Issue: Reloading Project files fails [23004]

Have created several shapefiles with Dotspatial and save the project setting into a .dspx file. but can't reload the file into the environment.
with the follow error 'An incompatible feature type was supplied and was not of type Point.', line 361 of XmlDeserializer.cs, when the type is actually MapPolygonLayer?
If I save just preexisting layers, all is fine. Only have problems with layers created by DotSpatial.
All layers have been saved to disk using FeatureSet.SaveAs(Filename).
Comments: Not DS issue.