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RTOS/AWR1642: A problem about CAN-FD of Secondary BootLoader

Part Number: AWR1642

Tool/software: TI-RTOS

I follow the PDF to use CAN-FD as a serial interface to download the application meta image.

And I use the code in e2e.ti.com/.../746928

I try to transmit CANFD data from AWR1642 to PC.

PC can't receive data.

And I try to transmit CANFD data from PC to AWR1642.

 It trigger the function  sblErrStatusCallback and the error reason is

/**
* @brief Protocol error in arbitration phase detected.
*/
CANFD_Reason_PROTOCOL_ERR_ARB_PHASE = 0x7

What could be the possible reason.