One option would be to open an error box.

一种选择是打开错误框。

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The user has to arrange the phone so a virtual “error box” is situated around his or her eye; the system can recognize the eye as long as it stays in this box.

用户需要把手机放在他或她的眼睛周围一个虚拟的“容错框”允许的范围内；只要眼睛在这个范围里，系统就能识别到眼球。

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If you receive this error message, just dismiss the dialog box, start the server, and redo the step you were on.

如果你发现弹出这个错误消息对话框，忽略它并在启动服务器后重新执行上面的步骤就可以了。

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Towards the end of the first half McGregor made an uncharacteristic error with a Ledesma curler into the box when he mis-judged the flight of the ball.

BBC: FBK Kaunas 2-1 Rangers (agg 2-1)

But they deservedly bagged an equaliser when Bardsley made up for his earlier error with an incisive ball into the box and veteran midfielder Berger cleverly guided it past Brad Friedel, who was making his 108th consecutive Rovers appearance.

BBC: SPORT | Football | Premiership | Blackburn 1-2 Aston Villa

According to the charts from GfK, Max Payne moved 8, 000 more box copies than Diablo 3, and you should be able to spot the error in calculations almost immediately.

FORBES: In No Way Did Max Payne Outsell Diablo 3