nand-writer verify failure!

I use OMAP-L137_FlashAndBootUtils_2_40 to transfer .bin data to flash ,but it fail,because it verify failure,

 it failed at ECC

if ((*hNandInfo->hEccInfo->fxnCorrect)(hNandInfo,&dest[hNandInfo->dataBytesPerOp*i],readECC) != E_PASS)
    {
      return E_FAIL;
    }