Update app.py

app.py

@@ -99,7 +99,7 @@ if 'key0' in st.session_state:
     with st.sidebar:
         topic = st.radio(
                         "Which category you want to explore?",
-                        ('Vulnerability'))
+                        (['Vulnerability']))
     
     if topic == 'Vulnerability':
         vulnerability_analysis.vulnerability_display()