Papua New Guinea's Supreme Court has ruled that the election of Sir Albert Kipalan as the country's next Governor General is invalid.
The Court found the nominations process for the Queen's representative was handled incorrectly by the clerk of parliament and ordered that a fresh election be held.
The matter was taken to court by PNG's Ombudsman Commission in September after concerns were raised about the process of nominations.
The five-judge bench of the Supreme Court ruled that the clerk of parliament should have rejected all nine nomination forms for the post because some MPs supported more than one candidate.
The Speaker of Parliament, Bill Skate, will now have to nominate a time for a fresh election.
The term of the outgoing Governor-General, Sir Silus Atopare, expired at midnight on Thursday.