problema la argumente

[TheDarkBlade]

function nitro( source, commandName ) 
    local team = getTeamName(getPlayerTeam( thePlayer)) 
    if (team == "Staff") then 
        local vehicle = isPedDrivingVehicle ( source ) 
        addVehicleUpgrade ( vehicle , 1010 ) 
    else 
    outputChatBox ("You are not part of staff", source ) 
    end 
end 
addCommandHandler ("nos", nitro) 
  

[2015-12-26 01:56:07] WARNING: WRPG_nos\nos.lua:2: Bad argument @ 'getPlayerTeam' [Expected player at argument 1, got nil] 
[2015-12-26 01:56:07] WARNING: WRPG_nos\nos.lua:2: Bad argument @ 'getTeamName' [Expected team at argument 1, got boolean] 

[starksZ]

function nitro( source, commandName ) 
    local team = getTeamName(getPlayerTeam( source)) --  
    if (team == "Staff") then 
        local vehicle = isPedDrivingVehicle ( source ) 
        addVehicleUpgrade ( vehicle , 1010 ) 
    else 
    outputChatBox ("You are not part of staff", source ) 
    end 
end 
addCommandHandler ("nos", nitro)