The com.Alsoft.DiskWarrior.prefs file is corrupt or write-protected. Quit DiskWarrior, throw away the preference file, then, open DiskWarrior again. A new preference file will be created with the default settings.
The preference file is located within the Preferences folder within the Library folder of your startup disk.
Caveat: I have no personal experience with either TTP or DW. That said, are you
starting up from the eDrive and then getting this error message?
If so, are you looking for the plist in
/Library/Preferences on the eDrive?
