Currently getting an error when loading. Deleted the addon- updated the addon and still not functioning properly.

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Getting ERROR: Error during initialization! intereface/Addon/Questie/Modules/QuestieInit.lua:28: attempt to call method 'Initialize' (a nil value)

I just updated to 1.15.3 Version of v10.3.9

Please also state if your quest issue is about Classic Era/SoM or Wotlk.
Classic SOD
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Tried to delete folder, delete the addon and reinstall. still this issue

Duplicate of #6334

Blizzard just randomly removed an UI element Questie relied on. We are already working on a proper fix.

A workaround is here #6334 (comment)