İnwalid Password Hatası

CREATE PROCEDURE ACCOUNT_LOGIN
@AccountID varchar(21),
@Password varchar(13),
@nRet smallint OUTPUT
AS
delete from currentuser where straccountid = @AccountID

---Created By CaNaVaReX--|
declare @cnt BigInt
declare @nDays smallint

select @nRet = count(straccountid) from tb_user where straccountid = @AccountID


if @nRet = 0
begin
insert into tb_user (straccountid, strpasswd, strSocNo, idays) values (@AccountID, @password, 1, '6')
end

select @cnt = count(straccountid) from currentuser
select @nDays = count(nDays) from PREMIUM_SERVICE where straccountid = @AccountID

if @cnt > 40 and @nDays = '0'
begin
set @nRet = 0
end

if @cnt > 40 and @nDays = null
begin
set @nRet = 0
end



DECLARE @Nation tinyint
SET @Nation = 0
-- tid login method by samma 2004.02.24
DECLARE @pwd varchar(13)

SET @pwd = null

SELECT @pwd = strPasswd FROM TB_USER WHERE strAccountID = @AccountID
IF @pwd IS null
BEGIN
SET @nRet = 0
RETURN
END
---Created By CaNaVaReX--|
ELSE IF @pwd <> @Password
BEGIN
SET @nRet = 0
RETURN
END

SELECT @Nation = bNation FROM ACCOUNT_CHAR WHERE strAccountID = @AccountID
IF @@ROWCOUNT = 0
BEGIN
SET @nRet = 1
RETURN
END
BEGIN
SET @nRet = 1
RETURN
END
BEGIN
SET @nRet = @Nation+1
RETURN
END
GO