What should be the content of a post submitted form validation message

Say I have a form, I submitted it, and received an error.

While each field with error is marked in a red frame and has an icon, and mouseover shows the exact reason for this error.

should the bottom (above the save / cancel) error be:

• General, for EX: you have 2 errors, please review the fields marked with X above.
• Or, specific, EX: Shift time exceed group available hours.