Error importing shape files

When we want to import shp files in Opencities MAP we get a error and the shape isn't loading.

Exception:
Methode niet gevonden: Void Bentley.Geospatial.Utility.StorageSerialization.PreventECClassReferenceLoops(Bentley.ECObjects.Schema.IECSchema).
System.MissingMethodException: Methode niet gevonden: Void Bentley.Geospatial.Utility.StorageSerialization.PreventECClassReferenceLoops(Bentley.ECObjects.Schema.IECSchema).
bij Bentley.Geospatial.DataInterchange.GDIExplorerImportNode.InvokeNodeOperation(String operation)

What can we do to solve the problem for our engineers?