bad argument #2 to 'WriteInt' (number expected, got no value)

[Pokniope]

Hey, so I'm trying to make something for DarkRP, however when the players get the money, this error comes up:
bad argument #2 to 'WriteInt' (number expected, got no value)
This is my server side code:
net.Receive( "Pay", function(len, ply)

    local sub = net.ReadEntity()
    local pay = net.ReadInt()

    if ply:IsPlayer() and ply:IsValid() then
        ply:addMoney( pay )
    end

    if sub:IsValid() and sub:IsPlayer() then
        if sub:getDarkRPVar("money") >= pay then
            sub:addMoney( -pay )
        end
    end

end)
And this is the client side:
hitoptions:AddOption( "Accept Money", function()
            for k, v in pairs(pricetable) do
                local sub = v.submitter
                local pay = v.price -- This printed in console fine.

                net.Start( "PayForHit" )
                    net.WriteEntity( sub )
                    net.WriteInt( pay )
                net.SendToServer()
            end
end)

[The_HAVOK]

you didn't append the bitcount
net.WriteInt( number integer, number bitCount )

[NeatNit]

net.WriteInt requires 2 arguments: the number (which you're providing just fine), and bit count. You should set the bit count to some constant based on the range of values you want to be able to send. For example, if 'pay' is always within the range -32,768 < pay < 32,767, you can use 16 bits. Consult the table linked in the wiki page, but notice that you have to take one extra bit from the one in that table.
net.ReadInt must have the same bit count argument as net.WriteInt.

[Pokniope]

Okay, so I've done this, and still doesn't seem to work.
Client:
priceops.DoDoubleClick = function( p, s )
priceoptions:AddOption( "Accept Money", function()
            for k, v in pairs(pricetable) do
                local sub = v.submitter
                local pay = v.price

                net.Start( "PayForMoney" )
                    net.WriteEntity( sub )
                    net.WriteInt( pay, 16 )
                net.SendToServer()
            end
end)
end
For server side:
net.Receive( "PayForMoney", function(len, ply)

    local sub = net.ReadEntity()
    local pay = net.ReadInt(16)

    ply:addMoney( pay )

    if sub:IsValid() and sub:IsPlayer() then
        if sub:getDarkRPVar("money") >= pay then
            sub:addMoney( -pay )
        end
    end

end)