Update app.py

app.py

@@ -1548,7 +1548,7 @@ with gr.Blocks(css=css, title="DataSynth — Analytics Hub") as demo:
         # fallback: empty
         return gr.Dropdown.update(choices=cols), gr.Dropdown.update(choices=cols)
 
-    profile_md.change(fn=_populate_prepare, inputs=[profile_state], outputs=[date_col, target_col])
+    profile_md.change(fn=_populate_prepare, inputs=[profile_state], outputs=[date_col_selected, target_col])
 
     # apply preparation
     def _apply_preparation(df_path, impute_num, impute_cat, fill_val, outlier_cols_txt, outlier_method, date_col_sel, date_fmt, text_cols_txt, transform_cols_txt, transform_method, drop_highcard_flag):