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I really don't know ...
"Casts a spell specified by name (optionally on a specified unit). Only protected (i.e. usable only by the Blizzard UI) if the given spell is castable (not passive) and is not a trade skill; can be used by addons to cast the "spells" that open trade skill windows."
How can I know if it is protected ? The code works for me ... What can I check ?
Thanks.
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