Dear sir/madam,
I am _________ (name), working as _________ (designation) in your company i.e. _________ (mention company name). My employee ID is ___________ (mention employee ID).
I am writing this email with most respect in reference to the ___________ (timesheet/project/work/other) assignment project file that I had submitted to you on __/__/____ (date). I feel apologetic to inform you that there has been an error in the file _________________ (mention error).
I apologize for the same and would like to state that I will ensure to double-check the submission next time.
I am attaching the revised file of the project with this email.
Please accept my heart felt apology.
Sincerely,
__________ (Your name),
__________ (Designation),
__________ (Employee ID Number)