Sometimes with nrf5340 audio dk application example i get the following:

I found that this error comes from src\drivers\cs47l63_comm.c file at:
ret = cs47l63_reset(cs47l63_driver);
if (ret != CS47L63_STATUS_OK) {
LOG_ERR("Failed to reset CS47L63");
return -ENXIO;
}
But i cannot find where is the definition of cs47l63_reset or the file cs47l63.h that is included on top.