Update app.py

app.py

@@ -54,7 +54,7 @@ writer = Agent(
   You transform complex concepts into compelling narratives.""",
   verbose=True,
   allow_delegation=True,
-  llm=llm_zephyr-7b-beta
+  llm=llm_zephyr_7b_beta
 )
 
 # Create tasks for your agents