Debug Problem

hi,when i debug my program in niosII, i select the option Download program to THE FLASH in Debugger page, but it always tips in the Console

Using cable "USB-Blaster [USB-0]", device 1, instance 0x00

Processor is already paused

Reading System ID at address 0x00000808: verified

Initializing CPU cache (if present)

OK

Downloading 00100020 ( 0%)

Downloading 00110000 (55%)

Downloading 01000000 (88%)

Downloaded 116KB in 1.8s (64.4KB/s)

Verifying 00100020 ( 0%)

Verifying 00110000 (55%)

Verifying 01000000 (88%)

Verify failed between address 0x1000000 and 0x1003607

Leaving target processor paused