Avrdude: Verification Error

Hi i have been using a old atmega 8 board. uptil now it was working fine but today when I was burning codes using IDE I get this error during uploading.

avrdude: verification error, first mismatch at byte 0x0000 0x3f != 0x00 avrdude: verification error; content mismatch

wat seems to be the problem? board is still runnnin the pgm which i ran last... I have no idea wat the error means. :o any suggestions?

fixed the problem reflashed with the bootloader everything back to normal... :D