UNIT_SPELLCAST_FAILED_QUIET is functionally equivalent to UNIT_SPELLCAST_FAILED. The only difference is UNIT_SPELLCAST_FAILED_QUIET tells the client to suppress error messages. Otherwise, you get the spell fail sound and occasionally your character saying they can't do something.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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