But my doubts were based solely on a simple mathematical error.

A simple error, no doubt, but one that grated on her.

As for the third message, it referred to a very simple error which could be set right in a couple of minutes.

He had not lived through four hundred or more dangerous years of human history by making tragically simple errors.

I'd heard simple error was enough to cause you to kill, actually.

So far it seems to be a simple clerical error.

The boy repeated none of the simple errors he had made first time around.

The failure to kill is an error simple to rectify.

Isn't it possible that there was a simple error on someone's part?

Some reports after the game said the total was 751 yards, but that may have been a simple error of arithmetic.