Update pipeline.py

pipeline.py

@@ -27,6 +27,7 @@ from langchain.chains import RetrievalQA, LLMChain
 from langchain.prompts import PromptTemplate
 from langchain.docstore.document import Document
 from langchain_core.caches import BaseCache
+from langchain_core.callbacks import Callbacks
 # from langchain_core.callbacks import CallbackManager
 # from langchain.callbacks.base import BaseCallbacks  # Updated import
 # from langchain.callbacks.manager import CallbackManager
@@ -216,11 +217,12 @@ try:
     if not fallback_groq_api_key:
         logger.warning("No Groq API key found for fallback LLM")
     groq_fallback_llm = ChatGroq(
-        model="default",  # Replace with your actual model name if different
+        model=GROQ_MODELS["default"],  # Replace with your actual model name if different
         temperature=0.7,
         groq_api_key=fallback_groq_api_key,
         max_tokens=2048,
-        cache=NoCache()  # Set cache explicitly
+        cache=NoCache(),  # Set cache explicitly
+        callbacks=[]  # Explicitly set callbacks to an empty list
     )
 except Exception as e:
     logger.error(f"Failed to initialize fallback Groq LLM: {e}")