Send number to server

[Yellow-Star]

Hey guys, I'm trying to send numbers to server but I have this error :

[ERROR] addons/awarn2/lua/autorun/client/cl_awarncopie.lua:374: bad argument #2 to 'WriteUInt' (number expected, got no value)
  1. WriteUInt - [C]:-1
   2. unknown - addons/awarn2/lua/autorun/client/cl_awarncopie.lua:374

Here is my code :

client :

tonumber(timebanvariable, 10)
print(timebanvariable)
    net.Start("timebans")
net.WriteUInt( timebanvariable )
    net.SendToServer()
server:

net.Receive( "timebans", function(len, ply, amount, self)
local timebanvariable = net.ReadUInt()  

print(timebanvariable)
ULib.addBan( "STEAM_1:0:143064608" , timebanvariable , nil, nil) 
end )

Is there anyone who could help me please ?

[SneakySquid]

Read the net.Write/ReadUInt wiki pages and the error you're getting.