RTOS/TDC7200EVM: Can't write to registers but can read all?

Tool/software: TI-RTOS

Hi, I am using TDC7200EVM with CC2640R2F (not MSP430Fxx). I also was not able to install GUI on Windows 10 it has KernelBase.dll and NationalInstrumentsLabView errors.

I read every post about this error. I do not understand what could be wrong?

#include <ti/drivers/SPI.h>
#include <xdc/runtime/System.h>
#include <ti/drivers/GPIO.h>
#include <ti/sysbios/knl/Task.h>

#include "Board.h"

uint8_t regComm[2] = { 0x40, 0x08 };
uint8_t regRead[2] = { NULL };

void spiCallback(SPI_Handle handle, SPI_Transaction *transaction){
    System_printf("%u\n", *((uint8_t *)transaction->rxBuf));
    System_printf("%u\n", *(((uint8_t *)transaction->rxBuf) + 1));
}

void *mainThread(void *arg0)
{
    GPIO_init();
    SPI_init();

    GPIO_write(23, 0);
    Task_sleep(1e1);
    GPIO_write(23, 1);
    Task_sleep(1e1);
    GPIO_write(11, 1);
    Task_sleep(1e1);
    GPIO_write(11, 0);

    SPI_Handle handle;
    SPI_Params params;
    SPI_Transaction transaction;
    SPI_Params_init(&params);

    params.mode = SPI_MASTER;
    params.dataSize = 8;
    params.transferMode = SPI_MODE_CALLBACK;
    params.transferCallbackFxn = spiCallback;
    handle = SPI_open(Board_SPI0, &params);
    if(handle == NULL){
        System_printf("Error.\n");
    }
    transaction.count = 2;
    transaction.txBuf = regComm;
    transaction.rxBuf = regRead;

    while(1){
        bool transferOK = SPI_transfer(handle, &transaction);
        if(!transferOK){
            System_printf("Error.\n");
        }
        Task_sleep(1e5);
    }
}

Thanks for your help.