Using Arduino with pixy2 for dual motor control

Hi I am trying to build a small AVG which is able to follow a learned color so I have arduino UNO and pixy2 and a dual motor controller.
First, I tried to read the serial output from pixy2 through arduino but I can not receive serial data. except this error.


Please advise me what part of the connection or configuration do I need to check.
Thank you.

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