What's the means"Verify failed between address .. and .."??

From the litle info you supply, I guess you are debugging a target and doing a download. After downloading the code, IDE verifies that it actually stored correctly by doing a readback. Somehow it did not store correctly. This can be due to many things. Check that your target is up to date and do pass timing verification. If your hardware is not functioning correctly this could be the result.

I want to know nios_ide verify what then it show me verify failed!