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FVID_exchange fail..........DM6437 problem...........

I use the examle of previewer_on_the_fly interfaced cmos sensor MT9P001

But the LCD dusplay is all black...........

And I find that the problem is here:

for(i = 0; i < NumOfIterations; i++)
    {
        if (IOM_COMPLETED != FVID_exchange(ccdcHandle, &FBAddr))
        {
            PREV_APP_PRINT("VPSS: Error in CCDC Exchange\r\n");
        }
        if (IOM_COMPLETED != FVID_exchange(vid0Handle, &FBAddr))
        {
            PREV_APP_PRINT("VPSS: Error in Video 0 Exchange\r\n");
        }
    }

It means FVID_exchange() error here.

But I am sure the PrevHandle, ccdhandle, vencHandle and vid0Handle are  all created .

Does anyone have the same problem ?