Update app.py

app.py

@@ -110,8 +110,9 @@ def convert_lwpolylines_to_polylines(dxf_file):
 
     # Find all LWPOLYLINE entities and convert them to POLYLINE entities
     for lwpline in doc.modelspace().query('LWPOLYLINE'):
-        # Create a POLYLINE entity
-        polyline = doc.modelspace().add_polyline2d(lwpline.vertices)
+        # Create a POLYLINE entity from the LWPOLYLINE's vertices
+        vertices = lwpline.vertices()  # Call the method to get vertices
+        polyline = doc.modelspace().add_polyline2d(vertices)
         
         # Copy attributes from the LWPOLYLINE to the new POLYLINE
         polyline.dxf.layer = lwpline.dxf.layer