I've had this issue where when i import a loadout from say, wowhead, and then import it, i have manually add all the talents and its giving me the message when i try to activate the loadout:

"[TalentLoadouts] Can't load Loadout. You must spend all available talent points to apply changes"

And adding that same string into the default blizzard loadout or Talent Tree Viewer, its working normally. Some strings "doesn't work" and some work like they should. Not getting any error either.