求大神相助

mrbull

各位大大们

AM_CustomFunctions中有两段代码，

function W_RetainBuff(UnitId, buffID, onlyMine)
  return W_BuffTime(UnitId, buffID, onlyMine) > 2;
end


function W_BuffTime(UnitId, buffID, onlyMine)
  local name, rank, icon, count, debuffType, duration, expirationTime, unitCaster, isStealable, shouldConsolidate, spellId = W_getBuff(UnitId, buffID, onlyMine);
  if(name ~= nil)then
    W_Log(1, "W_BuffTime:"..expirationTime..'->'..(expirationTime-GetTime()));
    return expirationTime-GetTime();
  end
  return 0;
end


现在我想用这两段在wow中调用，实现冰DK的”冰冷之爪（194879）“BUFF覆盖
wow中宏的写法
/am
/if W_BuffTime(NA_Player, 194879, onlyMine)<2
/cast 冰霜打击
/end


或者
/if W_BuffTime(NA_Player, 194879, onlyMine)<2 and UnitBuff(NA_Player,"冰冷之爪")
/cast 冰霜打击
/end



但是使用的时候都会报错，不知道是哪里的问题，请大大指点

错误如下
Message: ...rface\AddOns\AutomacroClassic\AM_CustomFunctions.lua:220: attempt to compare nil with number
Time: 12/23/16 01:23:03
Count: 2
Stack: ...rface\AddOns\AutomacroClassic\AM_CustomFunctions.lua:220: in function `W_Log'
...rface\AddOns\AutomacroClassic\AM_CustomFunctions.lua:378: in function `W_BuffTime'
[string "RunMacroText("")..."]:2: in main chunk
[C]: in function `RunScript'
Interface\AddOns\AutomacroClassic\AM_Core.lua:10: in function `?'
Interface\FrameXML\ChatFrame.lua:4385: in function `ChatEdit_ParseText'
Interface\FrameXML\ChatFrame.lua:4053: in function `ChatEdit_SendText'
Interface\FrameXML\ChatFrame.lua:2660: in function <Interface\FrameXML\ChatFrame.lua:2653>
[C]: in function `UseAction'
Interface\FrameXML\SecureTemplates.lua:346: in function `handler'
Interface\FrameXML\SecureTemplates.lua:619: in function `SecureActionButton_OnClick'
[string "*:OnClick"]:2: in function <[string "*:OnClick"]:1>
Locals: level = 1
msg = "W_BuffTime:29166.925->4.9789999999994"
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to compare nil with number"