Delete key error with flask_caching (using code from documentation)

I’m running the exact same example code (for FileSystem cache) as shown in Performance | Dash for Python Documentation | Plotly, and am getting the following error.

I’m trying to use this as a MRE for a bigger project, for which the server always stops suddenly, with no errors encountered.

Could this be the cause of it?

Using Flask-Caching 1.10.1, Dash 2.0.0

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