The sound.rar file you have requested: Add Ons / Spell Casting Error Fix - 0.84kb is not available. Perhaps try browsing all files for the game World of Warcraft and upload any files you want to share or are missing. This is the only information we could locate:
Get rid of the annoying spell casting error while spamming your abilities that, yes, are not ready yet. Unpack this file into your World of WarcraftData folder.