Bug 20523: Web.Help: AI Chat stopped working. Another try to get this working on HF Spaces

.gitignore

@@ -1,2 +1,3 @@
 AdregaAiChat61_Environment/
 .env
+venv/

app.py

@@ -17,6 +17,7 @@ from langchain_together import Together
 from langchain.prompts.chat import (
     ChatPromptTemplate, SystemMessagePromptTemplate, HumanMessagePromptTemplate,
 )
+from langchain_core.messages import HumanMessage
 
 # Load environment variables
 load_dotenv()
@@ -257,10 +258,8 @@ def render_chat():
             else:
                 if in_ul_list:
                     processed_lines.append("</ul>")
-                    in_ul_list = False
                 if in_ol_list:
                     processed_lines.append("</ol>")
-                    in_ol_list = False
                 processed_lines.append(line)
 
         if in_ul_list:
@@ -319,6 +318,11 @@ def handle_submit():
                 full_prompt = f"{system_prompt}\n\nConversation History:\n{context}\n\nUser: {user_input}\n\nAnswer directly without any reasoning or explanation of your thought process:"
 
         def call_llm(llm, prompt):
+            # Convert prompt to proper message format
+            if isinstance(prompt, str):
+                # For string prompts, create a proper message object
+                prompt = [HumanMessage(content=prompt)]
+            
             # prefer synchronous call
             try:
                 return llm(prompt)
@@ -339,9 +343,6 @@ def handle_submit():
         answer = call_llm(llm, full_prompt)
 
         
-        answer = call_llm(llm, full_prompt)
-
-
         # Extract content from response object
         if hasattr(answer, "content"):
             answer = answer.content
@@ -413,4 +414,4 @@ if st.button("Ask"):
 
 # 🔹 Display chat history in container
 with chat_container:
-    render_chat()
+    render_chat()