Young Judy, the editor of a trivia

Young Judy, the editor of a trivia publication, was having trouble with her computer. So she called Prem, the computer guy, over to her desk. Prem clicked a couple buttons and solved the problem. As he was walking away, Judy called after him, “So, what was wrong?” And he replied, “It was an ID ten T error.” A puzzled expression ran riot over Judy’s face. “An ID ten T error? What’s that … in case I need to fix it again??” He gave her a grin… “Haven’t you ever heard of an ID ten T error before?” “No,” replied Judy. “Write it down,” he said, “and I think you’ll figure it out.” (She wrote…) I D 1 0 T’