whats the error in this code?

[Machine]

so i have this code 

function replaceModel()  
  banner = engineLoadTXD("ce_payspray.txd", 12978) 
  engineImportTXD( banner, 12978 ) 
  dff = engineLoadDFF("sw_shed02.dff", 12978) 
  engineReplaceModel( dff, 12978 ) 
end 
addEventHandler ( "onClientResourceStart", getResourceRootElement(getThisResource()), replaceModel) 

can someone tell me what am i doing wrong because it does start but the banner didnt change 

the object i am trying to replace is the 12978 sw_SHED02

[#DaNiLiN]

 

Google translator
Is there a mistake?

[Machine]

What the hell are you talking about u didn't understand what I said ?

I already explained what's going on I am trying to change the little sign which is on the object 12978 so I can put my own logo . When I start the script it does start without errors but no change happen to the sign it stays the same 

 

[Dimos7]

function replaceModel()  
  banner = engineLoadTXD("ce_payspray.txd") 
  engineImportTXD( banner, 12978 ) 
  dff = engineLoadDFF("sw_shed02.dff") 
  engineReplaceModel( dff, 12978 )
end 
addEventHandler ( "onClientResourceStart", resourceRoot , replaceModel)

 

[iDannz [Breno]]

maybe the problem is in your texture or dff model

[Machine]

i thought of that at first but thanks to Dimos7 its working perfectly now