IWR1642BOOST: MSS is getting stuck in while(1) loop. Not getting sync with DSS.

I am trying to debug the vital example with CCS and getting stuck in a while loop. It is not getting sync with DSS perhaps. Here is a code where it is getting stuck. 

 while (1)
    {
        int32_t syncStatus;

        /* Get the synchronization status: */
        syncStatus = MMWave_sync (gMmwMssMCB.ctrlHandle , &errCode);
        if (syncStatus < 0)
        {
            /* Error: Unable to synchronize the mmWave control module */
            System_printf ("Error: MMWDemoMSS mmWave Control Synchronization failed [Error code %d]\n", errCode);
            return;
        }
        if (syncStatus == 1)
        {
            /* Synchronization acheived: */
            break;
        }
        /* Sleep and poll again: */
        Task_sleep(1);
    }  

syncStatus is always returning zero.  What could be the reason. any thoughts?