Update app.py

app.py

@@ -898,13 +898,13 @@ def create_quiz_interface():
         )
 
         view_cert_btn.click(
-            fn=lambda: gr.Tabs(selected=2),
-            outputs=tabs
+            fn=gr.Tabs(selected=2),
+            outputs=[tabs]
         )
 
         back_to_assessment.click(
             fn=lambda: gr.Tabs(selected=1),
-            outputs=tabs
+            outputs=[tabs]
         )
 
         score_display.change(