This Act shall not apply to anynor shall the Crown, the Governor, the Director-General of Lands, nor any public officer appointed by the Governor for the administration, management, or control of Crown lands or public reserves, or who may, by virtue of his office, however styled, have any such administration, management, or control, be liable under the authority of this Act to make any contribution towards the erection or repair of any fence between the land of any occupier and any Crown lands.(a) unoccupied Crown lands; or(b) public reserves