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Using pixy2 with arduino

Hi, I am following this tutorial. wiki:v2:hooking_up_pixy_to_a_microcontroller_-28like_an_arduino-29 [Documentation] (pixycam.com)
And I turned on the serial monitor to read messages but I have such fail messages rather than the messages I supposed to receive.

Please tell me what to check and solve this issue.
Also, how can I send PWM to my dual motor controller from arduino?
A specific tutorial would be a great help.
Thank you.

The message " Can BUS Shield init fail" is not from our software. It appears that other software is being executed, and I’m not sure why. Perhaps you’ve added some code from a CAN bus device?