fixed bug retreiver name

app.py

@@ -117,7 +117,7 @@ def predict(message, history, request: gr.Request):
     
 
     # Retrieve relevant documents for the current message
-    relevant_docs = retriever.similarity_search(message,k=3)  # Your retriever
+    relevant_docs = vectorstore.similarity_search(message,k=3)  # Your retriever
     
     # Build context from retrieved documents
     context = "\nExtracted documents:\n" + "\n".join([