MSP432E401Y: Problems Using ADCBUF one_shot

I am testing an adcbufmultisequencer example project

Changed recurrenceMode from ADCBuf_RECURRENCE_MODE_CONTINUOUS to ADCBuf_RECURRENCE_MODE_ONE_SHOT.

There is a problem that the adcBufCallback () function does not occur after starting the program for a while.
Once the problem occurred, running the ADCBuf_convert () function again did not cause the adcBufCallback () function.

Is there something wrong with the code I wrote below?
What is the cause?

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    /* Set up an ADCBuf peripheral in ADCBuf_RECURRENCE_MODE_CONTINUOUS */
    ADCBuf_Params_init(&adcBufParams);
    adcBufParams.callbackFxn = adcBufCallback;
    adcBufParams.recurrenceMode = ADCBuf_RECURRENCE_MODE_ONE_SHOT;          // <- one shot mode
    adcBufParams.returnMode = ADCBuf_RETURN_MODE_CALLBACK;
    adcBufParams.samplingFrequency = 1000000;
    adcBuf = ADCBuf_open(CONFIG_ADCBUF0, &adcBufParams);

    /* Configure the conversion struct for Sample Sequencer 0 */
    continuousConversion[0].arg = NULL;
    continuousConversion[0].adcChannel = CONFIG_ADCBUF0CHANNEL_0;
    continuousConversion[0].sampleBuffer = sequencer0BufferOne;
    continuousConversion[0].sampleBufferTwo = sequencer0BufferTwo;
    continuousConversion[0].samplesRequestedCount = ADCBUFFERSIZE;                   // <- Buffer size is 100

    /* Configure the conversion struct for Sample Sequencer 1*/
    continuousConversion[1].arg = NULL;
    continuousConversion[1].adcChannel = CONFIG_ADCBUF0CHANNEL_1;
    continuousConversion[1].sampleBuffer = sequencer1BufferOne;
    continuousConversion[1].sampleBufferTwo = sequencer1BufferTwo;
    continuousConversion[1].samplesRequestedCount = ADCBUFFERSIZE;

    if (!adcBuf){
        /* AdcBuf did not open correctly. */
        while(1);
    }

    while(1) 
    {
        cb_cnt = 2;
        if(ADCBuf_convert(adcBuf, &continuousConversion[0], 1) != ADCBuf_STATUS_SUCCESS)     // <- call function every loop
        {
           while (1) usleep(1);
        }
        if(ADCBuf_convert(adcBuf, &continuousConversion[1], 1) != ADCBuf_STATUS_SUCCESS)
        {
           while (1) usleep(1);
        }

        if (clock_gettime(CLOCK_REALTIME, &ts) == -1)
            return 0;

        ts.tv_sec += 1;

        if(sem_timedwait(&adcbufSem, &ts) < 0)              // <- use sem_timedwait() for debug instead sem_wait()
        {
            adc_fail_count++;
            continue;
        }

        adc_done_count++;

    }