[Python] Layout must be a dash component or a function that returns a dash component

I just set up Dash on a local (home) Ubuntu server and to test am using their own samples. Only thing I changed is the app.run. When I execute the file I get the title error.

I looked around here on Stackoverflow and on the Plotly forums but the only info I can find is about code errors. I have checked that I copied and pasted the samples correctly, and they are.

Any pointers which can be provided are appreciated.

from dash import Dash, html

app = Dash()

app.layout = [html.Div(children='Hello World')]

if __name__ == '__main__':
#app.run(debug=True)
app.run_server(debug=True, host='0.0.0.0')
# also tried app.run(debug=True, host='0.0.0.0') here with same outcome




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