Lawyers from Jones Day on Friday apologized to a Virginia federal judge for exposing secret grand jury information in a court filing, an error the law firm attributed to a failure by the legal team to use certain software that is designed to “avoid such issues.”

Jones Day attorneys are representing the drug company Indivior Inc., charged in the U.S. District Court for the Western District of Virginia with the alleged fraudulent marketing of a prescription opioid. The company, contesting the Justice Department’s charges, recently filed court papers arguing the case should be dismissed for alleged government misconduct.