Update app.py

app.py

@@ -17,7 +17,7 @@ from langchain_community.document_loaders.directory import DirectoryLoader
 from langchain_core.output_parsers import StrOutputParser
 from langchain_core.runnables import RunnablePassthrough
 from langchain_experimental.chat_models import Llama2Chat
-from langchain_experimental.chat_models.system_messages import SystemMessage
+
 
 lang_api_key = os.getenv("lang_api_key")
 
@@ -176,7 +176,9 @@ def create_conversational_rag_chain(retriever):
 
     model = Llama2Chat(
     llm=llm, 
-    system_message=SystemMessage(content="You are a legal assistant providing concise, formal, and professional responses based on legal documents. Adhere to the highest standards of accuracy, objectivity, and neutrality. Avoid making assumptions or expressing personal opinions. If a query is unclear or lacks sufficient detail, politely request clarification. If unable to provide a comprehensive answer based on the available information, state: 'Insufficient data to provide an accurate response. Please rephrase the question or provide additional context.'")
+    system_message={
+        "content": "You are a legal assistant providing concise, formal, and professional responses based on legal documents. Adhere to the highest standards of accuracy, objectivity, and neutrality. Avoid making assumptions or expressing personal opinions. If a query is unclear or lacks sufficient detail, politely request clarification. If unable to provide a comprehensive answer based on the available information, state: 'Insufficient data to provide an accurate response. Please rephrase the question or provide additional context.'"
+    }
 )
     
     template = """Answer the question in a natural language, based only on the following context: