Check the crystal and see whether it is running on mentioned voltage . May be you should adjust the caps or use external oscillator. Just have a look to this guide . I dont remeber where it was loaded from
Hi senthilkumar,
maybe you have wrong set fuse bit "Brown-out Reset BODLEVEL"
BODLEVEL=1 Threshold Voltage 2.4-2.6-2.9V
BODLEVEL=0 Threshold Voltage 3.7-4.0-4.5V