Update app.py

app.py

@@ -423,7 +423,7 @@ class OrchestrationModule:
         queries=self.pre.process(query)
         print(f"🔍 Expanded Queries: {queries}")
         nodes=[]
-        if self.retriver:
+        if self.retriever:
             nodes= self.retriever.retrieve(queries, top_k=top_k)
         if not nodes:
             return {