You had one job Kendall. One.
Although you do have to feel sorry for the girl. We've all flubbed a sentence at some point in our lives. And before you get too mean remember that the girl is only eighteen years old (which, yes, means that she should be able to read a few sentences aloud without to much trouble but she grew up in the Kardashian household, hairspray has probably passively rotted her brain).
It's hard to know if the autocue simply failed or if Kendall genuinely couldn't read the words in front of her (she blamed her lack of contact lenses), but by almost saying One Direction instead of 5 Seconds of Summer and then just plain giving up on reading the prompter and declaring yourself 'the worst reader', this is basically your foolproof guide on what not to do when you're on live TV.