runtime error

Traceback (most recent call last): File "/home/user/app/app.py", line 12, in <module> iface = gr.Interface(fn=greet, inputs="text", outputs=sum) File "/home/user/.local/lib/python3.10/site-packages/gradio/interface.py", line 206, in __init__ assert isinstance(outputs, (str, list, IOComponent)) AssertionError

Container logs: