Update app.py

app.py

@@ -899,12 +899,12 @@ def create_quiz_interface():
 
         view_cert_btn.click(
             fn=gr.Tabs(selected=2),
-            outputs=[tabs]
+            outputs=tabs
         )
 
         back_to_assessment.click(
             fn=lambda: gr.Tabs(selected=1),
-            outputs=[tabs]
+            outputs=tabs
         )
 
         score_display.change(