*edit: I removed my post because I am unsure if the installation process on the Droid2 is the same as D1. Regardless you will need the correct rom file for droid 2, which is tanzanite I believe.
Are you installing on a droid 2? Sapphire is only for Droid1 you will have to use the Tanzanite release instead of sapphire on croms.net for your rom file.
I would go to the droid 2 roms section here firsthttp://www.droidforums.net/forum/droid-2-roms/ we cannot provide support for droid 2 because this is the droid 1 section. Roms are installed differently on d2. You need koushs bootstrap. Pick a rom in the d2 rom section and ask for support there. I am unfamiliar with droid 2 hacking sorry