Error when creating stored procedure - sql

Question

I'm noob at stored procedures, I have created a stored procedure that take some parameters from C# page, then send back result as OUTPUT parameter.
I need to do some calculation to get end date, so I end up using a lot of IF statements. However, when I create the stored procedure I get error that I didn't know how to solve, every thing seems correct!.
Here is the stored procedure code:
CREATE PROCEDURE sp_RenewSubscription
-- Add the parameters for the stored procedure here
#Reference nvarchar(100),
#SubscribtionID nvarchar(100),
#Months int,
#Result nvarchar(200) OUTPUT
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE #EndDate as nvarchar;
DECLARE #MonthCounts as int;
IF NOT EXISTS(SELECT [Reference] FROM [Norton].[dbo].[SubscriptionStatus] WHERE [Reference] = #Reference)
SET #Result = '0: Reference ID not found'
ELSE
IF NOT EXISTS(SELECT [Reference] FROM [Norton].[dbo].[SubscriptionStatus] WHERE [Reference] = #Reference AND [SubscribtionID] = #SubscribtionID)
SET #Result = '0: Subscribtion ID not found'
ELSE
BEGIN
SELECT TOP 1 #EndDate = [EndDate], #MonthCounts = [SubscriptionMonthCount] FROM [Norton].[dbo].[SubscriptionStatus] WHERE [Reference] = #Reference AND [SubscribtionID] = #SubscribtionID
IF #EndDate = '0'
BEGIN
UPDATE [Norton].[dbo].[SubscriptionStatus]
SET [SubscriptionMonthCount] = #Months + #MonthCounts
WHERE [Reference] = #Reference AND [SubscribtionID] = #SubscribtionID
END
ELSE
BEGIN
UPDATE [Norton].[dbo].[SubscriptionStatus]
SET [SubscriptionMonthCount] = #Months
WHERE [Reference] = #Reference AND [SubscribtionID] = #SubscribtionID
END
SET #Result = '1: Done Successfully'
END
GO
END
GO
This is error I got:
Msg 102, Level 15, State 1, Procedure sp_RenewSubscription, Line 44
Incorrect syntax near 'END'.
Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'END'.*
Thanks,

Answer 1

Remove the go from before the end of the procedure.
ie
END
SET #Result = '1: Done Successfully'
END
GO --- <-- get rid of this
END

Answer 2

Try this:
CREATE PROCEDURE Sp_renewsubscription
-- Add the parameters for the stored procedure here
#Reference NVARCHAR(100),
#SubscribtionID NVARCHAR(100),
#Months INT,
#Result NVARCHAR(200) output
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET nocount ON;
DECLARE #EndDate AS NVARCHAR;
DECLARE #MonthCounts AS INT;
IF NOT EXISTS(SELECT [reference]
FROM [Norton].[dbo].[subscriptionstatus]
WHERE [reference] = #Reference)
SET #Result = '0: Reference ID not found'
ELSE IF NOT EXISTS(SELECT [reference]
FROM [Norton].[dbo].[subscriptionstatus]
WHERE [reference] = #Reference
AND [subscribtionid] = #SubscribtionID)
SET #Result = '0: Subscribtion ID not found'
ELSE
BEGIN
SELECT TOP 1 #EndDate = [enddate],
#MonthCounts = [subscriptionmonthcount]
FROM [Norton].[dbo].[subscriptionstatus]
WHERE [reference] = #Reference
AND [subscribtionid] = #SubscribtionID
IF #EndDate = '0'
UPDATE [Norton].[dbo].[subscriptionstatus]
SET [subscriptionmonthcount] = #Months + #MonthCounts
WHERE [reference] = #Reference
AND [subscribtionid] = #SubscribtionID
ELSE
UPDATE [Norton].[dbo].[subscriptionstatus]
SET [subscriptionmonthcount] = #Months
WHERE [reference] = #Reference
AND [subscribtionid] = #SubscribtionID
SET #Result = '1: Done Successfully'
END
END
GO