When we have to write an email related to Errors.

•  It was a typographic error . I have corrected it immediately . and forwarded to Mr Ramesh . Sincere apologies .
• At the last we sincerely regret for the error happened at our end and all the inconvenience caused
• Please ignore my previous e-mail, I have made a small correction in the attached document.
• Allow me to apologise for any inconvenience this may cause.
• In reference to your below mail, please note that we have discussed with our concern and they are not accepting these documents with different address