Thread:Extension talk:BedellPenDragon/Error upon implementation/reply (3)

By the way, I inadvertently removed BedellPenDragon.i18n.php earlier and only recently added it back. I am concerned about the possibility that you might be missing that file. Please confirm that you have updated to the latest version of the extension (v1.0.4) and that you have BedellPenDragon.i18n.php. Then we can resume troubleshooting. Thanks.

Also, you may want to see what happens if you upgrade to MediaWiki 1.22. See Download_from_git. I don't know if that has any relation to your problem; I forget if I relied on anything that's not available in 1.21.