ErrorMonster is a small addon to block a few standard action errors from printing. Please note that it does not block the "Error Speech" that comes with them - you have to disable that in Sound Options.
- Ability is not ready yet.
- Not enough energy
- There is nothing to attack.
- That ability requires combo points
- Your target is dead
- Another action is in progress
ErrorMonsters slash commands are accessed through /errormonster or /em. Commands exist to list, add and remove filters to the blocking list.
Someone feel free to expand the text if they find something to write.
Things that might be worth adding are options to redirect errors to a ChatFrame and blocking these things from spamming the combat log as well.
Files here: http://www.wowace.com/projects/error-monster/