I'd suggest you devote a little time to consult the FAQ (link) <https://github.com/weewx/weewx/wiki/WeeWX-Frequently-Asked-Questions> for this and other things new users frequently run into. It'll help explain this one as well as other things you might run into as you get more familiar with. Your particular issue has its own page (link) <https://github.com/weewx/weewx/wiki/faq-permission-denied> as it might be the most frequent of the frequently asked questions.
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