Update app.py

app.py

@@ -193,7 +193,7 @@ with gr.Blocks() as demo:
     btn_reset_df.click(reset_cate, inputs=df_category, outputs=df_category)
     btn_filter.click(filter_by_topics, inputs=[dd_filter, df_category_hidden], outputs=df_category)
     btn_add_categories.click(add_categories, inputs=[df_category, df_category_hidden],outputs=[dd_filter,df_category_hidden])    
-    btn_dl_cate.click(download_cate, inputs=btn_dl_cate, outputs=fi_categories)
+    btn_dl_cate.click(download_cate, inputs=df_category, outputs=fi_categories)
     
     #charts
     btn_chart.click(create_bar_plot, inputs=[fi_excel, dd_label1, dd_label2], outputs=[plt_figure])