Generete Count of Sales Week by Week

I am running this script to generate a SQL Calender.  I then want to join the calendar to my database and get a week by week count of Items Sold by week.  My calendar generates no issue, but my Select statement is what is giving me fits.  Can someone help remedy this?

--Script To Generate Calendar
USE [TestDB]
GO
ALTER PROCEDURE [dbo].[CreateCalendar]
AS
BEGIN
if OBJECT_ID ('dbo.Calendar') IS NOT NULL
 begin
  drop table dbo.Calendar
 end
CREATE TABLE dbo.Calendar
(
 CalendarYear int NOT NULL,
 CalendarWeek int NOT NULL,
 WeekStartDate varchar(50),
 WeekEndDate varchar(50),
 constraint PK_Calendar PRIMARY KEY (CalendarYear, CalendarWeek)
)
SET datefirst 6
DECLARE @StartDate datetime, @NumOfDays int
SET @StartDate = '20130101'
SET @NumOfDays = 720
;WITH calendar
AS (
 SELECT
  TOP (@NumOfDays)
  dateadd(day, row_number() OVER (ORDER BY sc1.column_id)-1, @StartDate) AS CalendarDate
 FROM sys.columns sc1
  cross join sys.columns sc2
)
INSERT INTO dbo.Calendar (CalendarYear, CalendarWeek, WeekStartDate, WeekEndDate)
SELECT
 DATEPART(year, c.CalendarDate) AS Year,
 convert(varchar(100),DATEPART(week, c.CalendarDate)) AS Week, --DATEPART(week, c.CalendarDate) AS Week,    
 MAX(CASE DATEPART(WEEKDAY, c.CalendarDate) WHEN 1 then convert(varchar(50),c.CalendarDate,101) else null end) As StartDate,
 MAX(CASE DATEPART(WEEKDAY, c.CalendarDate) WHEN 7 then convert(varchar(50),c.CalendarDate,101) else null end) As EndDate
FROM calendar c
GROUP BY DATEPART(year, c.CalendarDate), DATEPART(Week, c.CalendarDate)
ORDER BY Year, startdate, convert(varchar(100),DATEPART(week, c.CalendarDate))--Week
update dbo.Calendar set WeekStartDate = convert(VARCHAR(50), dateadd(day, 1, dateadd(week, -1, cast(WeekEndDate as datetime))), 101) where WeekStartdate is null
update dbo.Calendar set WeekEndDate = convert(VARCHAR(50), dateadd(day, -1, dateadd(week, 1, WeekStartDate)), 101) where WeekEndDate is null

SELECT * FROM dbo.Calendar 
END
--Query trying to select a Count based off week production
SELECT
  COUNT(a.ItemSold) As Sold,
  a.InternalSalesRep,
  cl.CalendarWeek
FROM
    ProductionDatabase a
  INNER JOIN
    dbo.Calendar cl
  ON a.SaleDate >= cl.WeekStartDate AND
     a.SaleDate < cl.WeekEndDate
GROUP BY cl.CalendarWeek, a.SaleDate, a.InternalSalesRep
ORDER BY cl.CalendarWeek ASC