ran some instances with my twink, got this at trial of the kings all the time:
Message: ...dOns\VEM-Party-MoP\MogushanPalace\TrialoftheKing.lua:99: bad argument #1 to 'find' (string expected, got nil)
Time: 10/26/13 22:25:31
Count: 7
Stack: [C]: in function `find'
...dOns\VEM-Party-MoP\MogushanPalace\TrialoftheKing.lua:99: in function `handler'
Interface\AddOns\VEM-Core\VEM-Core.lua:463: in function <Interface\AddOns\VEM-Core\VEM-Core.lua:450>
Locals: (*temporary) = " Kuai the Brute uses his [Shockwave] ability!"
(*temporary) = nil
(*temporary) = "string expected, got nil"
ran some instances with my twink, got this at trial of the kings all the time: