Because the error happens in every instance, it is systematic.

Another error happened in 2011 where an impossible maths question was set.

These errors have been happening for more than 20 years.

So a similar error cannot happen again, he said.

This may seem simple enough, mistakes and errors will happen.

But when errors happen now, the world is paying attention.

But errors also happen when doctors* and patients have problems communicating.

This is very difficult, and of course errors can happen.

Quite why this error could have happened is unknown.

If each plan had genuinely been considered on its merits these errors would not have happened.