Update app.py

app.py

@@ -157,6 +157,6 @@ with demo:
   b1.click(audio_a_text, inputs=audio, outputs=text)
 
   b2 = gr.Button("Classification of speech")
-  b2.click(print_s, inputs= source_lang,target_lang, outputs=text)
+  b2.click(print_s, inputs= [source_lang,target_lang], outputs=text)
 
 demo.launch()