Outdated Python?

What is the problem?

How do I install/migrate to an updated Python file?

What did you already try to solve it?

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Have you tried running in safe mode?

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Did running in safe mode solve the problem?

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Systeminfo Bundle

You can download this in OctoPrint's System Information dialog ... no bundle, no support!)

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Additional information about your setup

OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible

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Short answer... Reflash your microSD card with the latest OctoPi image.

With the complete absence of any particulars about your environment (i.e. none of the requested information in the template), that is the best answer we can provide. You tell us more about YOUR environment, and we can give you a better answer.