The troubled Maryland health exchange is facing another setback after a programming error sent Medicaid enrollment packets for as many as 1,078 customers to the wrong addresses, it announced on Sunday. The packets included the names, dates of birth and Medicaid ID numbers of the customers, but they did not include Social Security numbers or financial or medical information, the Department of Health and Mental Hygiene announced. The state stopped mailing all enrollment packages when it discovered the error Friday, and Medicaid and IT employees worked over the weekend to find the issue, which was identified as a programming error by Noridian Healthcare Solutions, the primary contractor that received a $71 million contract in 2012 to develop the exchange, the announcement said.