Update app.py

app.py

@@ -60,7 +60,7 @@ def train_and_forecast(
     date_range = pd.date_range(df.index[0], pd.DateOffset(months=prediction_length//2) + df.index[-1], freq=freq)
     print(date_range)
     new_df = df.reindex(date_range)
-    df = df.interpolate(method='spline', order=2)
+    new_df = new_df.interpolate(method='spline', order=2)
     print(new_df)
     gluon_df = PandasDataset(new_df, target=new_df.columns[0], freq=freq)
     print(gluon_df)