Some Detroit retirees were sent erroneous ballots this month for voting on the city's plan to deal with $18 billion of debt, including public pensions and exiting bankruptcy, Reuters reported yesterday. About 2,000 of the ballots sent to members of the city's general retirement system contained errors, lawyers said. Carole Neville, an attorney representing a court-appointed committee for Detroit retirees, said new ballots needed to go out to these retirees as soon as possible. Bankruptcy Judge Steven Rhodes demanded to know by Friday who was responsible for the ballot mess. Thousands of Detroit creditors must vote and return their ballots by July 11.