Update app.py

app.py

@@ -18,6 +18,7 @@ def generate():
 with gr.Blocks() as demo:
     btn = gr.Button("Generate")
     out = gr.Textbox(label="Generation", visible=False)
-    btn.click(fn=generate, outputs=[out, out])
+    btn.click(fn=generate, outputs=out)
+    btn.click(fn=change_visibility, outputs=out)
 
 demo.launch(debug=True)