Error : "Invalid API member or option"

This worked before.. :/

Pastebin API : http://pastebin.com/api

Im not sure why it seems to error, all though I think its the username,password.

local API = 'http://www.pastebin.com/api/api_post.php'
local Paste_Option = 'paste'
local User_Key = '' -- removed key
local Private_Paste = 0
local Paste_Name = Actinium.Services.UrlEncode({"Actinium-Rankedlist"})
local ExpireDate = "N"
local Paste_Format = "lua"
local Coding = 'wut'
local Login_Name = "jillmiles1"
local Login_Password = "removed password"
for i,v in next,Actinium.Ranked do
    for _,plr in next,game:service'Players':GetPlayers() do
        if v.Name:lower() == plr.Name:lower() then
            Coding = Actinium.Services.UrlEncode({
                Name=plr.Name,
                Desc=v.Desc or 'Auto ranked',
                Rank=v.Rank or 0,
                Color=v.Color or 'New Yeller',
                Notifcations=true
            })
        end
    end
end

local Result = Actinium.Services.Post(
    API,                    
"api_option="..Paste_Option.."&api_user_key="
..User_Key.."&api_user_name="
..Login_Name.."&api_user_password="
..Login_Password.."&api_paste_private="
..Private_Paste.."&api_paste_name="
..Paste_Name.."&api_paste_expire_date="
..ExpireDate.."&api_paste_format="
..Paste_Format.."&api_dev_key="
..User_Key.."&api_paste_code="..Coding,
        Enum.HttpContentType.ApplicationUrlEncoded
)
repeat wait(.3)
until Result
print(tostring(Result))
print'Posted ranks!'