Must declare the scalar variable "@ERROR"

USE [MuOnline]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER Procedure [dbo].[WZ_PeriodItemInsert]

  @userGuid        int,
  @CharacterName    varchar(10),
    @ItemCode        int,
  @OptiOnType        tinyint,
  @EffectType1        tinyint,
  @EffectType2        tinyint,
    @TotalUsePeriod    int,
  @ExpireDate        varchar(20)
AS
BEGIN
    DECLARE  @ErrorCode int
    DECLARE  @periodItemIndex int

    SET  @ErrorCode = 0
    SET  @periodItemIndex = 0

    SET XACT_ABORT ON
    SET NOCOUNT ON

    BEGIN TRANSACTION

    SELECT   @periodItemIndex = PeriodIndex FROM T_PeriodItem_Info WHERE UserGuid =  @userGuid AND CharacterName =  @CharacterName AND OptionType =  @OptiOnType AND UsedInfo = 1

    --IF (  @periodItemIndex != 0 )
    --BEGIN
    --    UPDATE T_PeriodItem_Info SET UsedInfo = 0 WHERE UserGuid =  @userGuid AND CharacterName =  @CharacterName AND OptionType =  @OptiOnType AND UsedInfo = 1
    --END

    INSERT INTO T_PeriodItem_Info (UserGuid, CharacterName, ItemCode, OptionType, EffectType1, EffectType2, LeftTime, BuyDate, ExpireDate, UsedInfo) VALUES
    (  @userGuid,  @CharacterName, @ItemCode,  @OptiOnType,  @EffectType1,  @EffectType2, @TotalUsePeriod, GETDATE(),  @ExpireDate, 1 )
    IF(   @ERROR <> 0 )
    BEGIN
        SET  @ErrorCode = 2
    END

    IF (  @ErrorCode  <> 0 )
        ROLLBACK TRANSACTION
    ELSE
        COMMIT TRANSACTION

    SELECT  @ErrorCode

    SET NOCOUNT OFF
    SET XACT_ABORT OFF
END