‘Too many mistakes on offense make Eric Moulds an unhappy man. After avoiding questions from the media all week, and amid speculation that he’s discouraged over his contract situation, the Buffalo Bills marquee wide receiver said Thursday his frustrations stem from the team’s play — specifically on offense — and are not personal. “I’m more frustrated two, not really to get the ball bills, I’m more frustrated for the offense as a unit drive,” Moulds said as the Bills prepare to play the Green Bay Packers Sunday. “Last year the defense carried us. I don’t want it to be a situation where it becomes a one-dimensional team as far as the defense carrying us each week.” Moulds added that he was particularly discouraged by the number of times Bills quarterback Rob Johnson was knocked down in Sunday’s 16-13 win over Tennessee. Johnson was eventually knocked out in the fourth quarter with a nerve “stinger” in his lower left leg. “I was upset about the way they were hitting Rob,” he said. “You could just see his eyes during the game, he was worried about getting hit so much that it takes a little bit away from his game.”‘