added callback Manager instead of empty callbacks in the fallback groq llm

pipeline.py

@@ -191,28 +191,31 @@ CACHE_SIZE_LIMIT = 1000
 #     logger.error(f"Failed to initialize ChatGroq: {e}")
 #     raise RuntimeError("ChatGroq initialization failed.") from e
 
-# Fix for ChatGroq initialization with model_rebuild
 
 from langchain_core.callbacks import CallbackManager
 from langchain_core.callbacks.base import BaseCallbackHandler
-from langchain_core.caches import BaseCache  # Import BaseCache (this might be needed)
-
-
-
+from langchain_core.caches import BaseCache
 
 # Initialize ChatGroq with the callback manager
 try:
     # First, ensure BaseCache is defined (if needed)
     class NoCache(BaseCache):
         """Simple no-op cache implementation."""
-        def __init__(self): pass
-        def lookup(self, prompt, llm_string): return None
-        def update(self, prompt, llm_string, return_val): pass
-        def clear(self): pass
+        def __init__(self): 
+            pass
+            
+        def lookup(self, prompt, llm_string): 
+            return None
+            
+        def update(self, prompt, llm_string, return_val): 
+            pass
+            
+        def clear(self): 
+            pass
     
     # Call model_rebuild() before initializing
     ChatGroq.model_rebuild()
-
+    
     # Then initialize the model
     fallback_groq_api_key = os.environ.get("GROQ_API_KEY_FALLBACK", os.environ.get("GROQ_API_KEY"))
     groq_fallback_llm = ChatGroq(
@@ -220,10 +223,9 @@ try:
         temperature=0.7,
         groq_api_key=fallback_groq_api_key,
         max_tokens=2048,
-        callbacks=[]  # Add the callback manager here
+        callback_manager=CallbackManager([])  # Use CallbackManager instead of raw list
     )
-    
-    
+        
 except Exception as e:
     logger.error(f"Failed to initialize ChatGroq: {e}")
     raise RuntimeError("ChatGroq initialization failed.") from e