help me... Flashing rom QS-i9300-JB(OB2) failed

I m using Samsung S III GT- I9300I . I downloaded QS-i9300-JB(OB2) rom from this. But while installing rom, it shows
Flashing AGNi kernel
assert failed: write_raw_image("/tmp/boot.img","/dev/block/mmcblk0p5")

Please help me.. now while switch on my device... it shows a big green android logo and "downloading"