A precious experience, admitting mistakes with subordinates

There is a small problem,
and it has been solved for two days. The
customer sent me an email.
I was furious and criticized my subordinates.
Found out when I sat down and watched.
That problem was solved long ago,
this is another problem.
Also trying to solve it.

On my way here this morning,
I thought about whether I should apologize to him all the way.
Finally convinced myself to apologize to him.
Wrong is wrong.
Apologize when you should.