Managed Extensibility Framework Question

Hello, newby MEF here: I have 2 interfaces to classlibraries I want to compose with my main application. What i am trying to achieve is a directory of .dlls that I can update/manage for the application as a whole.

[InheritedExport]
public interface IObject1
{   method1();   method2(); }

[InheritedExport]
public interface IObject2
{
     method3();   method4(); } 

Now in the main application thread, I get an error duplicate 'Import' attributes. I want to use both objects in my main application, I just don't know how to import them properly.

#region Imports section

        [Import(typeof(Object1), AllowRecomposition = true)]
        [Import(typeof(Object2), AllowRecomposition = true)]

        private Object1 _obj1;
        private Object2  _obj2;
   #endregion

 private void Compose()
{
   dirCatalog = new DirectoryCatalog(@"D:\Folder");
  AssemblyCatalog assemblyCat = new AssemblyCatalog(System.Reflection.Assembly.GetExecutingAssembly());

  AggregateCatalog catalog = new AggregateCatalog(assemblyCat, dirCatalog);

CompositionContainer container = new CompositionContainer(catalog);
container.ComposeParts(this);

}