What steps will reproduce the problem?
1.  Play a mage with spellsteal
2.  Steal a lightning shield (I stole it from Iron Thane Argrum in Grizzly Hills)
3.  Notice the errors appear

What is the expected output? What do you see instead?
The expected output is none, or that I would only hear the 5 counts building up of lightning shield (since the addon things I'm a shaman for obtaining the spell).
Actual result:
 I got all 5 sounds as if I had just built it up (as a shaman) and then an error as it tried to continue counting up to the 19 stacks that I had stolen.  The chat window also filled with a few "ERROR: ComboPoints is expected to be between 0 and 9."  It's great that the assertion was caught, but it looks like it may need to be supressed, also.  The error that appeared in the log was regarding trying to play a sound file for the 6th and up point.  

What version of the product are you using?
v1.3

Do you have an error log of what happened?
Date: 2011-10-11 15:35:38
ID: 1
Error occured in: Global
Count: ∞
Message: Usage: PlaySoundFile("soundfile", optional["SFX","Music","Ambience" or "Master"])
Debug:
   (tail call): ?
   [C]: ?
   [C]: PlaySoundFile()
   HearKitty\HearKitty.lua:395 KittyPlayOneSound()
   HearKitty\HearKitty.lua:198
      HearKitty\HearKitty.lua:189

Please provide any additional information below.