How can I resolve the "CAN message send failed" error in my AVR microcontroller project using Zephyr

#include <zephyr.h>
#include <device.h>
#include <drivers/can.h>
#include <drivers/spi.h>

// Function prototypes
void can_init(void);
int can_send(const struct zcan_frame *msg);
int can_receive(struct zcan_frame *msg);
void spi_init(void);