Spectral
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Instead of UnitCastAimedSpell(unit,spell,target), use startThread(UnitCastAimedSpell,unit,spell,target). The error will remain, but it won't affect the script's further execution.
StartThread doesn't seem to work; it appears that you can't start multiple threads during combat.
Создается карта про эльфов: Воссоединение - готовность 71%