Why was Dante Bichette charged with an error?

Question

On June 17, 1991, the Brewers were playing the Athletics in Milwaukee County Stadium. In the top of the 9th inning, Jose Canseco hit a routine pop fly to Dante Bichette in right field. Bichette caught the ball. But as he reached to grab it from his glove, the ball popped out and landed on the ground.

Much to Bichette's surprise (and everyone else's too) the umpire ruled Bichette hadn't held onto the ball long enough.

Meanwhile, the ever-lazy Canseco hadn't even bothered to run to first base. He went halfway down, turned, and ran back to the dugout.

Bichette calmly tossed the ball to Willie Randolph at second base, who in turn flipped it to Franklin Stubbs at first base for the forceout.

Even though Canseco never reached base, Bichette was charged with an error. Why? If an infielder bobbled the ball but still threw out the runner there's no error. So why was Bichette charged with one?

Here's the game.

http://www.baseball-reference.com/boxes/MIL/MIL199106170.shtml

Answer 1

He was charged an error because Canseco did reach first.  He was tagged out between first and second.

The boxscore play by play as this description:

"Canseco out at 2B/RF-2B-1B"

If it happened the way you described then it would say "Canseco out at 1B...." in which case there would not have been an error.