The first paychecks of the new school year for 349 D.C. Public Schools teachers were late or included insufficient funds, according to school system officials, who attributed the problem to timekeeping errors.

Teachers were supposed to receive their first checks on Friday, Sept. 6. But for nearly one-tenth of the school system’s teachers, payroll time was either entered incorrectly or not entered at all by employees responsible for reporting that information, according to spokeswoman Melissa Salmanowitz.

Officials worked to correct the problem immediately, Salmanowitz said, and supplemental checks, for the balance owed to teachers, were available starting Saturday afternoon. Checks not picked up by Sunday afternoon will be delivered to teachers at school on Monday, she said.

Teachers are “the backbone of our system and they should never have to worry about their paychecks,” Salmanowitz wrote in an e-mail. “We deeply regret that this error occurred and apologize for any inconvenience it may have caused.”