Update app.py

app.py

@@ -77,10 +77,10 @@ def generate_story(text):
         print(result)
         input_waves.append(result)
     
-    output_file = 'output.wav'
+    output_wav = 'output.wav'
 
     join_wav_files(input_waves, output_wav)
-    return story_result, 'output_wav'
+    return story_result, 'output.wav'
 
 def app(text):
     story = generate_story(text)