"Computer Error" joke

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