Update app.py

app.py

@@ -21,7 +21,7 @@ def convert_df(df):
 if 'visibility' not in st.session_state:
     st.session_state['visibility'] = 'visible'
     st.session_state.disabled =  False
-    st.session_state.placeholder =  True
+    st.session_state.placeholder =  'xx'
 
 original_title = '<p style="font-family:Trebuchet MS; color:#FD7456; font-size: 25px; font-weight:bold; text-align:center">ASCARIS</p>'
 st.markdown(original_title, unsafe_allow_html=True)