The same thing happens in writing computer software: all programs have bugs (after all, it is writing).
I started my adult education computer class this way: You will write programs, they will have bugs. You inherit them, they will have bugs.
I just gave you 120 pages of handouts. There are 5 typos — bugs. Let me know when you see them. They may be coded correctly, but give wrong answers.
Just like reject, regret this error…
Unfortunately, computer bugs can kill people, as we have seen in recent plane crashes. Do anything to find the bugs.