Runtime Build Sql In Stored Procedures With Output Param Q?

Hi

I'm trying to make this to work and need help

Here my SP and I'm building sql with output param.

Alter PROCEDURE lpsadmin_getSBWReorderDollars
(
@out decimal(10,2) output,
@sType varchar(20),
@dSearchDateFrom datetime,
@dSearchDateTo datetime,
@sOrderType char(1)
)
AS
DECLARE @sql as nvarchar(4000)

SELECT @sql = 'SELECT @out = SUM(Price*Quantity)
FROM PortraitReOrderOrder jcpre
INNER JOIN Orders jcpor
ON OrderID = OrderID
WHERE jcpor.Archive = 0
AND jcpre.CreatedDate between ''' + CONVERT(varchar(10),
@dSearchDateFrom, 101) + ''' AND ''' + CONVERT(varchar(10),
@dSearchDateTo, 101) + ''''

IF @sOrderType <> 0
SELECT @sql = @sql + ' AND LEFT(OrderType,3) = (SELECT OrderTypeName
FROM OrderTypes WHERE OrderTypeID = ' + @sOrderType + ')'
IF @sType = 'Active'
SELECT @sql = @sql + ' AND PATINDEX(''%SHR%'', AccessCode) = 0 '
IF @sType = 'Shared'
SELECT @sql = @sql + ' AND PATINDEX(''%SHR%'', AccessCode) <> 0 '
Print @sql
EXECUTE sp_executesql @sql

It gives me an error message
Must declare the variable '@out'.

Please help