Thanks for the report, spambox. This is caused by the removal of Blessing of Salvation in WotLK; you can comment out or remove the two lines in Filter.lua that refer to it (164, 172) as a temporary work around.
@jink: your problem is unrelated; you went a very long time without updating your PitBull, it seems. PitBull converted from LibDogTag-2.0 to LibDogTag-3.0 and your custom tags will need to be updated to the new syntax as a result. (You can also just reset them to defaults, if you prefer.)
Thanks for the help! Got everything working now.