The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Sorry, that was a little
transpositional ERROR.
Breaking Bad Season 2, Episode 8

Oh, Oh, Lord, that
multiplication ERROR!
The Big Bang Theory Season 5, Episode 16

There is no more room for ERROR.
Breaking Bad Season 3, Episode 10

see the ERROR...
Westworld Season 3, Episode 8

since the day Leonard
made that multiplication ERROR.
The Big Bang Theory Season 5, Episode 16