Update app.py

app.py

@@ -60,7 +60,7 @@ with gr.Blocks(css=css) as demo:
             run_button = gr.Button("Convert", scale=0)
         result = gr.Gallery(label="Result")
         download_button = gr.Button("Download All as ZIP")
-        error_message = gr.Textbox(label="Message", interactive=False, visible=False)
+        error_modal = gr.Modal("No files to download. Please upload and convert AVIF files first.")
     converted_files = []
 
     def handle_conversion(avif_files):
@@ -70,8 +70,9 @@ with gr.Blocks(css=css) as demo:
         
     def handle_download():
         if not converted_files:
-            return None, "No files to download. Please upload and convert AVIF files first."
-        return zip_files(converted_files), ""
+            error_modal.show()
+            return None
+        return zip_files(converted_files)
 
     run_button.click(
         fn=handle_conversion,
@@ -81,6 +82,6 @@ with gr.Blocks(css=css) as demo:
     download_button.click(
         fn=handle_download,
         inputs=[],
-        outputs=[gr.File(), error_message]
+        outputs=[gr.File()]
     )
 demo.queue().launch()