Thread:Extension talk:GuidedTour/Error message after installing GuidedTour: "Detected bug in an extension! Hook GuidedTourHooks..."/reply

Thanks for the report. Core changed a few months ago so that a  was no longer required here. However, I'm glad to add it so it isn't an obstacle to supporting older versions of MediaWiki core. This is fixed in latest master, so you can just pull to update.