Issues with /dropmoney for custom Gamemode

[GameWalrus]

[lua]
function cashAct(ply,text,team)

if(string.sub(text,1,5)=="/give") then
local playEye=ply:GetEyeTrace()
local toGiveTo=playEye.Entity
local giveAmt=tonumber(string.sub(text,6))
local givenCash=tonumber(toGiveTo:GetNWInt("Cash"))
local myCash=tonumber(ply:GetNWInt("Cash"))
toGiveTo:SetCash(givenCash+giveAmt)
ply:ChatPrint("Cash given!")
ply:SetCash(myCash-giveAmt)
return nil
end

if(string.sub(text,1,10)=="/dropmoney") then
local moneyCase=ents.Create("moneyBriefcase")
moneyCase:SetPos(ply:GetPos())
moneyCase:Spawn()
local dropAmt=tonumber(string.sub(text,11))
moneyCase:SetVar("Holding",dropAmt)
local myCash=ply:GetNWInt("Cash")
ply:SetCash(myCash-dropAmt)
end

end

hook.Add("PlayerSay","Give",cashAct)
[/lua]

That's the code for it dropping, however I get no errors and it should work fine, but it says error attempt to derive from unknown entity or something like that, can someone help?

[Lily]

moneyBreifcase probably isnt a valid entity, look for other errors or list us everything it says (full entity error thing)

[editline]24th October 2010[/editline]

even though if it was that it should spew a lua error though

[editline]24th October 2010[/editline]

Can you give us a full dump of the console?

[GameWalrus]

It doesn't say anything more. I can however give you the files for the entity, if that will help.

[editline]24th October 2010[/editline]

Could the problem be due to that it's not derived from sandbox?