Update app.py

app.py

@@ -78,7 +78,7 @@ def invoke(openai_api_key, use_rag, prompt):
             result = rag_chain({"query": prompt})
             result = result["result"]
         except Exception as e:
-            returns e
+            return e
     else:
         chain = LLMChain(llm = llm, prompt = LLM_CHAIN_PROMPT)
         result = chain.run({"question": prompt})