1. You cannot create objects in global scope which is the same as init: https://gjs.guide/extensions/review-guidelines/review-guidelines.html#only-use-init-for-initialization - Line 21 (extension.js) - Line 14-20 (classes/task_item.js) - Line 17 (classes/task_settings.js) - Line 18 (classes/task_timer.js) 2. Lang is a deprecated module. Please remove it for the next version: https://gjs.guide/extensions/review-guidelines/review-guidelines.html#general-advice Learn how to remove Lang from your code: https://gjs.guide/guides/gjs/legacy-class-syntax.html If you need any help with your extension you can ask us on: GNOME Matrix channel: https://matrix.to/#/#extensions:gnome.org IRC Bridge: irc://irc.gimpnet.org/shell-extensions