Update app.py

app.py

@@ -86,7 +86,7 @@ else:
     #df_dm_transport_dictionary = df_dm_transport.to_dict('index')
     
     # filter activity nodes attributes
-    mask_connected = dfMatrix.index.tolist()
+    mask_connected = df_dm.index.tolist()
     lu_columns = []
     for name in df_lu.columns:
       if name.startswith("lu+"):