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World of Warcraft: disable the red error text

If you don't want any error messages at all (without an addon) use these commands:
/run SLASH_UI_ERRORS_OFF1 = "/erroff"
/erroff
This will disable the red text and the error sounds and speech.

If you want to selectively disable errors, define /erroff and /erron somewhere:
/run SLASH_UI_ERRORS_OFF1 = "/erroff"
/run SLASH_UI_ERRORS_ON1 = "/erron"
then make macros for the abilities you want to spam like this:
#showtooltip
/erroff
/cast SomeSpell
/erron
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