[HELP] What's the Problem?

[Imposter]

client side

  
addEvent ("viewGUI", true) 
function viewShop () 
  if (getLocalPlayer() == source) then 
    guiSetVisible (carshopWindow, true) 
    showCursor (true) 
  end 
end 
addEventHandler ("viewGUI", getRootElement(), viewShop) 
  

server side

  
function markerHit (hitPlayer, matchingDimension) 
  if (source == carShopMarker) then 
    triggerClientEvent ("viewGUI", hitPlayer) 
  end 
end 
addEventHandler ("onMarkerHit", getRootElement(), markerHit) 
  

somehow the information wont get to the client side, but the server side is working well.

[Castillo]

function markerHit (hitPlayer, matchingDimension) 
  if (source == carShopMarker) then 
    triggerClientEvent (hitPlayer,"viewGUI", hitPlayer) 
  end 
end 
addEventHandler ("onMarkerHit", getRootElement(), markerHit) 

Try with that.