You've probably managed to install or partially install something that's not supported by your device (e.g., the ScreenSavers or Fonts hacks), and now it's broken the common scripts because they're picking up an FBInk binary that doesn't support your device.
Remove the linkss & linkfonts folders, reinstall the JB hotfix and it should behave.
EDIT: Nope, that was (probably) an actual bug in FBInk
. I've pushed updated snapshots which should fix it.