Can you provided a few more details?? What exact version of FreeNAS are you trying to install? 8.02? AMD64 or i386? What are your hardware specs? The FreeNAS Forum crystal ball isn't working. ;)
I have it installed on a CF to sata I dont get that error any more it is now giving a page fault 12 error. any ideas? (memtest passed and was able to boot up ubuntu on it)