Added genfit surfaces to B0 tracker.

src/B0Tracker_geo.cpp

 #include <map>
 #include "DD4hep/DetFactoryHelper.h"
+#include "DD4hep/Printout.h"
+#include "DD4hep/Shapes.h"
+#include "DDRec/Surface.h"
+#include "DDRec/DetectorData.h"
+#include "XML/Layering.h"
+#include "XML/Utilities.h"
+
+
 #include "Acts/Plugins/DD4hep/ActsExtension.hpp"
 #include "Acts/Definitions/Units.hpp"
 
 using namespace std;
 using namespace dd4hep;
+using namespace dd4hep::rec;
 using namespace dd4hep::detail;
 
 /*! B0 Tracker.
@@ -219,7 +228,7 @@ static Ref_t create_B0Tracker(Detector& description, xml_h e, SensitiveDetector
             //std::cout << " adding ACTS extension" << "\n";
             Acts::ActsExtension* moduleExtension = new Acts::ActsExtension("XZY");
             comp_elt.addExtension<Acts::ActsExtension>(moduleExtension);
-            volSurfaceList(comp_de)->push_back(volplane_surfaces[m_nam][ic]);
+            volSurfaceList(comp_elt)->push_back(volplane_surfaces[m_nam][ic]);
           }
         //} else {
         //  pv = layer_vol.placeVolume(