fix name of pandas variable in filter

app.py

@@ -25,7 +25,7 @@ def create_phase_diagram(elements, max_e_above_hull, color_scheme, plot_style, f
         Composition(row["chemical_formula_descriptive"]), 
         energy = row['energy'], 
         correction = row['energy_corrected']-row['energy'], 
-        entry_id = row['immutable_id']) for n,row in df.iterrows() if len(
+        entry_id = row['immutable_id']) for n,row in train_df.iterrows() if len(
         set(row['elements']).intersection(element_list))>0 and set(
         row['elements']).issubset(element_list)]
     # Fetch elemental entries (they are usually GGA calculations)