Mike Pettine's message: Packers' defensive players will be held accountable

GREEN BAY, Wis. -- No mental errors. No missed assignments.

It sounds so simple, but those are the things that wrecked the Green Bay Packers' defense far too often last season.

So it’s no wonder the team’s new defensive coordinator, Mike Pettine, has put that message out to his players even before they officially go to work on Monday, when the offseason workout program begins.

“He reached out to me early in the offseason and kind of just let me know the style of play that we’re going to have and just his need and want of having organization throughout every single part, making sure there’s no mental errors, no missed assignments, any of that,” Packers linebacker Blake Martinez told reporters…