Yes, ERRORS is a Scrabble word!

Letter values in Scrabble US: E 1, R 1, R 1, O 1, R 1, S 1.

Is it a valid word?

ERRORS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a wrong action attributable to bad judgment or ignorance or inattention
inadvertent incorrectness
a misconception resulting from incorrect information
(baseball) a failure of a defensive player to make an out when normal play would have sufficed
departure from what is ethically acceptable
(computer science) the occurrence of an incorrect result produced by a computer
part of a statement that is not correct

Also: erroneous belief, computer error.