If a motion judge errs in law, will the decision be reviewed on a standard of correctness?

However, if the motion judge errs in law, the decision will be reviewed on a standard of correctness; at para. 84: 84 Of course, where the motion judge applies an incorrect principle of law, or errs with regard to a purely legal question, such as the elements that must be proved for the plaintiff to make out her cause of action, the decision will be reviewed on a correctness standard (Housen v. Nikolaisen, at para. 8).