When I run a python project with Dash the"Hello Dash" page showed up instead of the page which should show up

Can you provide your code (or sample) to help explain your problem?

Have you checked that you killed any previous Dash process? I often accidentally leave web servers running in my IDE.

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Thank you!! I just don’t know how to kill the previous Dash process…I restarted my laptop and the problem was solved.

Thank you!! The problem was solved by using Damian’s way.