Project won't download

[abame]

I am having issues with the pin_change_int example. I have not changed anything to the code, but it will not load onto my board. In fact, pressing load in this project doesn't even erase the flash because when I try to load it, the same old program keeps running. If I manually clear the flash and then try to load, it says it loaded successfully, but nothing works (I'm assuming LED1 is supposed to turn on when BUTTON1 is pressed). 

[abame]

I think something in these functions is the critical issue because I copied and pasted them into a working project and now that project will not load onto the board.

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    nrf_drv_gpiote_out_toggle(PIN_OUT);
}

/**
 * @brief Function for configuring: PIN_IN pin for input, PIN_OUT pin for output, 
 * and configures GPIOTE to give an interrupt on pin change.
 */
static void gpio_init(void)
{
    ret_code_t err_code;

    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);
    
    nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_SIMPLE(false);

    err_code = nrf_drv_gpiote_out_init(PIN_OUT, &out_config);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;

    err_code = nrf_drv_gpiote_in_init(PIN_IN, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(PIN_OUT, true);
}