Update app.py

app.py

@@ -845,7 +845,7 @@ footer { display: none !important; }
 with gr.Blocks(css=custom_css, title="SmartTutor AI") as demo:
 
     # State
-    quiz_state = gr.State()
+    quiz_state = gr.State(None)
 
     with gr.Column(elem_classes="header-box"):
         gr.HTML(
@@ -997,9 +997,10 @@ with gr.Blocks(css=custom_css, title="SmartTutor AI") as demo:
 
 if __name__ == "__main__":
     print("Starting SmartTutor AI on Hugging Face...")
-    demo.queue().launch(
+    demo.queue()
+    demo.launch(
         server_name="0.0.0.0",
         server_port=7860,
         share=False,
-        show_api=False,  # This helps avoid the Schema generation error
+        show_api=False,
     )