problem with loading program into flash

Hi:

     I' m using TMS320F28027 for my project. And I tried loading a example program named flash in DSP2802x_examples(v126). 

     But when I was loading the program into flash, an error happened like this:

    "Data verification failed at address 0x3FF6621. Please verify target memory and memory map."

   And the .cmd file  is like:

   FLASHD      : origin = 0x3F0000, length = 0x002000     /* on-chip FLASH */

   FLASHC      : origin = 0x3F2000, length = 0x002000     /* on-chip FLASH */

   FLASHA      : origin = 0x3F6000, length = 0x001F80     /* on-chip FLASH */

  So how can I do to solve this problem?

  Thank you very much.