Show My DPS 

function ShowMyDPS:AddAmount(event, ...)
  local timestamp, eventName, hideCaster, sourceGUID, sourceName, sourceFlags, sourceRaidFlags, destGUID, destName, destFlags, destRaidFlags, meleeAmt, spellName, spellSchool, spellAmt, overhealing = ...
  
  -- 0x1111 is COMBATLOG_OBJECT_TYPE_PET | COMBATLOG_OBJECT_CONTROL_PLAYER | 
  --           COMBATLOG_OBJECT_REACTION_FRIENDLY | COMBATLOG_OBJECT_AFFILIATION_MINE
  -- 0x0511 is COMBATLOG_OBJECT_TYPE_PLAYER | COMBATLOG_OBJECT_CONTROL_PLAYER | 
  --           COMBATLOG_OBJECT_REACTION_FRIENDLY | COMBATLOG_OBJECT_AFFILIATION_MINE
  -- i.e. if the source was either my pet or myself, this counts
  if bit.band(sourceFlags, 0x1111) == 0x1111 or bit.band(sourceFlags, 0x511) == 0x511 then -- Checking source
    if eventName and string.find(eventName, "_DAMAGE") then
      -- Get recount-like feature
      if InCombatLockdown() then
        cbtDmgAmount = cbtDmgAmount or 0
        cbtStart = cbtStart or GetTime() - 3.5
      else
        cbtDmgAmount = 0
        cbtStart = GetTime() - 3.5
      end
      
      -- DPS crap
      if string.find( eventName, "SWING" ) then -- Checking dps type
        cbtDmgAmount = cbtDmgAmount + meleeAmt -- Melee swing only has one parameter (amount)
      else
        cbtDmgAmount = cbtDmgAmount + spellAmt -- Anything else (except ENVIRONMENTAL) has amount in the 15th slot
      end

      -- Calc
      self:CalculateDmg()
      
      -- Show
      if InCombatLockdown() then
        self:RefreshFrame()
      end
    end
    
    -- Heal crap
    if eventName and string.find(eventName, "_HEAL") then
      if InCombatLockdown() then
        cbtHealAmount = cbtHealAmount or 0
        cbtStart = cbtStart or GetTime() - 3.5
      else
        cbtHealAmount = 0
        cbtStart = GetTime() - 3.5
      end
      
      cbtHealAmount = cbtHealAmount + ( spellAmt - overhealing ) -- Only effective healing
      
      -- Calc
      self:CalculateHeal()
      
      -- Show
      if InCombatLockdown() then
        self:RefreshFrame()
      end
    end
  end
end

Date: 2011-07-08 10:11:02
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\ShowMyDPS\ShowMyDPS.lua line 133:
   attempt to perform arithmetic on local 'arg13' (a string value)
Debug:
   (tail call): ?
   ShowMyDPS\ShowMyDPS.lua:133: ?()
   ...let\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:147:
      ...let\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:147
   [string "safecall Dispatcher[24]"]:4:
      [string "safecall Dispatcher[24]"]:4
   [C]: ?
   [string "safecall Dispatcher[24]"]:13: ?()
   ...let\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:92: Fire()
   ...ce\AddOns\Skillet\Libs\AceEvent-3.0\AceEvent-3.0.lua:120:
      ...ce\AddOns\Skillet\Libs\AceEvent-3.0\AceEvent-3.0.lua:119

Change:

	local timestamp, event, hideCaster, sourceGUID, sourceName, sourceFlags, destGUID, destName, destFlags, arg10, arg11, arg12, arg13, arg14 = ...

Into:

	local timestamp, event, hideCaster, sourceGUID, sourceName, sourceFlags, sourceRaidFlags, destGUID, destName, destFlags, destRaidFlags, arg10, arg11, arg12, arg13, arg14 = ...