Try this: 
function info() 
    local rowindex, columnindex = guiGridListGetSelectedItem ( GridListePlayer ) 
    playername = guiGridListGetItemText ( GridListePlayer, rowindex, 1) 
    guiSetText ( LabelName, "Name : " .. playername .. " " ) 
    triggerServerEvent("informations",localPlayer,targetsource, playername) 
end 
  
addEvent("informations", true) 
addEventHandler("informations",root,function(targetsource) 
    local thePlayer = getPlayerFromName(targetsource) 
end) 
 
and may I ask? What is this script for?