"To err is human, to purr is feline." --Robert Byrne.
Error is the state, quality and condition of being wrong. It is a mistake or an accidental wrong action or a false statement not made deliberately.
"Pardon me, it is an error on my part."
Err is to commit a sin or a vital mistake. It is to stray away from a definite path into the figurative bush.
When you make a mistake, you err. "err" is a verb while "error" is a noun.
Error and err both relate to making a mistake. ‘Error’ is a noun, while ‘err’ is a verb.
“Ali made too many errors on the test, so he didn’t pass.”
“I’d rather err on the side of caution than jump in without knowing all the facts.”
You will also hear ‘err’ in the English aphorism:
“To err is human; to forgive, divine.”