Question about earned runs in baseball?

In one inning last night, the first three batters reached on errors, routine ground that were either miffed or overthrown. The fourth batter walked and a run was scored. Then someone doubled, and scored everyone, including the guy that walked. So, since the first three batters grounded into would-be outs 1, 2 and three, do none of the runs scored that inning count as earned runs?