anothre fix

model/conversation_chain_singleton.py

@@ -38,11 +38,11 @@ class ConversationChainSingleton:
         if not cls._instance:
             cls._instance = super(ConversationChainSingleton, cls).__new__(cls)
             # Initialize your conversation chain here
-            cls._instance.conversation_chain = cls.get_conversation_chain(cls._instance)
+            cls._instance.conversation_chain = cls.get_conversation_chain()
         return cls._instance
 
     @staticmethod
-    def get_conversation_chain(instance):
+    def get_conversation_chain():
         """
         Create a conversational retrieval chain and a language model.