SQL Server :: Procedure Or Function Has Too Many Arguments Specified When Execute

When i execute this SP in DB, it works fine. But when i execute from asp.net app it is throwing error: Procedure or function ... has too many arguments specified

GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROC [dbo].[sp_Customer]
@brchID char(40),
@brchName VARCHAR(50),
@userID VARCHAR(50)
AS
BEGIN
TRANSACTION
DECLARE @req_pk int
DECLARE @customer_org_pk int
IF EXISTS(SELECT * FROM [customer] WHERE [org_id] like @brchID)
BEGIN
SELECT [org_pk] FROM [customer] WHERE [org_id] like @brchID
END
ELSE
BEGIN
EXEC sp_get_next_control_no 'organization.org_pk',@customer_org_pk out;
INSERT INTO [customer] (org_pk,[org_id],[org_name])
VALUES(@customer_org_pk,@brchID,@brchName)
SELECT [org_pk] FROM [customer] WHERE [org_id] like @brchID
END
--Address Book Entry
IF NOT EXISTS(SELECT * FROM [address_book] WHERE [prsn_id] like @userID)
BEGIN
exec sp_get_next_control_no 'person.prsn_pk',@req_pk out;
END
IF (@@ERROR <> 0)
BEGIN
-- Rollback the transaction
ROLLBACK
RETURN
END
ELSE
BEGIN
COMMIT
END

Here is my asp method:

public static string Customer(string brchId, string brchName, string userId)
{
string spName = "st_Customer";
SqlParameter OrgPk = new SqlParameter("@org_pk", SqlDbType.Int);
OrgPk.Direction = ParameterDirection.Output;
OrgPk.Size = 50;
try
{
SqlHelper.ExecuteNonQuery(Config.ConnectionString,
CommandType.StoredProcedure, spName,
new SqlParameter("@brchID", brchId),
new SqlParameter("@brchName", brchName),
new SqlParameter("@userID", userId),
OrgPk
);
return Convert.ToString(OrgPk.Value);
}
}