GENERAL PART
TITLE TWO
CRIMINAL OFFENCE
1. General provisions on criminal Offences
Error of law
Article 19
(1) An act committed under an irreparable error of law shall not constitute a criminal offence.
An irreparable error of law exists where a perpetrator was not obliged to know and could not have known that the act he committed was prohibited.
Mistake of law - national proceedings
EDIT.