No...a fielding error that allows the runner to get on base and that runner scores is not an earned run and does not count against earned run average.

Earned Run Average

Boof Bonser

A hurler is a slang term for a pitcher in baseball. ERA stands for Earned Run Average and is a statistic for pitchers that shows the number of 'earned' runs a pitcher allows for every nine innings. An earned run is a run that is scored without the help of an error or passed ball. One might think that the earned run average of a pitcher is similar to that of the batting average of a hitter.

ERA is the abbreviation for Earned Run Average. ERA is calculated on a per-9-inning basis, so if you give up 2 earned runs in 3 innings, then your ERA is 6.00.