As Wakefield says, you can ignore this; essentially, syncing to Pavlovia opens your experiment (as a JS file) in Coder view, and this is an error with the interface of Coder view. Failing to open Coder doesn’t stop the sync, so your experiment should still have synced to Pavlovia.
The error arises from the package we use to make the PsychoPy Standalone app, which is fairly old and poorly maintained. This is a large part of the reason for us developing PsychoPy Studio, a full rebuild of the app using a more modern framework. If this error is recurring often, it may be worth switching to Studio. If you need version 2025.2.4 specifically, you can set it as the “Use version” parameter in Experiment Settings and Studio will install that version of the PsychoPy library to run your experiment in.