Have you installed "Community Sources" via the installer app? If it does not appear after doing that how about adding http://hackthatphone.com/1.xml as a source in installer.
dude when you jailbreak 1.1.1 now on jailbreakme.com you get automaticly the oktoprep files.
so you do not need to to that anymore.
read the updates on installer, you'll see.