Converts memory_token_limit to int

app.py

@@ -44,7 +44,7 @@ llm = ChatOpenAI(model_name=llm_name, temperature=0)
 retriever=vectordb.as_retriever()
 memory = ConversationTokenBufferMemory(
     llm = llm,
-    max_token_limit=memory_token_limit,
+    max_token_limit=int(memory_token_limit),
     memory_key="chat_history",
     return_messages=True
 )