Misspelled function in the API?

[rudemaster]

Am trying to Hotfix some of the simpler addons and have run into this error multiple times.

Message: ..\AddOns\_NPCScan\_NPCScan.lua line 231:
Usage: GetAchievementCrieriaInfo(achievementID, criteriaIndex)
......................................^ T missing
Notice the Misspelling? is that in the API? I get the error to change Go away if I change it to the misspelled version..