help warning

[Apo]

hi please help me for fix error

WARNING: test\test.lua:2: Bad argument @ 'getElementModel' [Expected element at argument 1, got nil]

local vehplayer = getPedOccupiedVehicle(thePlayer)       
    if not (getElementModel(vehplayer) == 582)  then 
        outputChatBox("you are not in news car",thePlayer,255,0,0) 
        else 
..... 
  
...... 
  
..... 
  
  

[Dimos7]

function playerOnVehicle(thePlayer) 
   local vehplayer = getPedOccupiedVehicle(thePlayer) 
   if not (getElementModel(vehplayer) == 582) then 
       outputChatBox("You are not in news car!", thePlayer, 255, 0, 0) 
   end 
end 

[IIYAMA]

if vehplayer then 
    if getElementModel(vehplayer) ~= 582  then 
  
    else 
  
    end 
end