NRF52811 Custom Board Stucks at err = bt_enable(NULL);

Hi,

We have developed custom board using NRF52811 and Now we are devloping software for the same. Current version of software transmits button information in advertising mode.

But code is hanging at 

    err = bt_enable(NULL);
    if (err)
    {
        LOG_ERR("Bluetooth init failed (err %d)\n", err);
        return;
    }
When i step in and check it is getting hanged at 
    err = bt_dev.drv->open();
    if (err) {
        LOG_ERR("HCI driver open failed (%d)", err);
        return err;
    }
Can you help me this? As this is custom board i don't think we will have different images for Network and application.
Attaching code alsobt-fund-main (1).zip
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