Update app.py

app.py

@@ -100,9 +100,14 @@ st.set_page_config(page_title="ChatbotGuide", layout="wide")
 
 if 'submit' not in st.session_state:
     st.session_state.submit = False
+if 'error' not in st.session_state:
+    st.session_state.error = ""
 
 st.title("Chatbot Guide")
 
+if st.session_state.error != "":
+    st.error(st.session_state.error)
+
 uploaded_files = st.file_uploader("Upload PDFs Here", type="pdf", accept_multiple_files=True)
 st.success(f"{len(uploaded_files)} document(s) loaded...")
 
@@ -123,7 +128,7 @@ if st.session_state.submit:
     try:    
         client.Model.list()
     except:
-        st.error("OpenAI API key is invalid")
+        st.session_state.error = "OpenAI API key is invalid"
         st.session_state.submit = False
         st.rerun()
         
@@ -151,6 +156,6 @@ if st.session_state.submit:
             mime='text/csv',
         )
     else:
-        st.error("Please upload at least 1 PDF")
+        st.session_state.error = "Please upload at least 1 PDF"
         st.session_state.submit = False
         st.rerun()