🔗 inessential: Error Messages
There is, however, old wisdom — perhaps from an earlier version of the Mac HIG — that says how to create error messages: they should be of the form “Can’t x because of y.” They may optionally include additional detail and/or recovery steps. “Can’t x because of y. Something is true. Try a thing.” A similar form is this: “Noun can’t x because y.” (As in “‘Downloaded.app’ can’t be opened because it is from an unidentified developer....