Problem With OLE DB Command Transformation

I've used the OLE DB Command transformation serveral times to call stored procs and pass in a set of parameters. For some reason, every time I try to use it now w/ any parameters, I get this error:

OLE DB Command [188]: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005. An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Syntax error, permission violation, or other nonspecific error".

I've set the SqlCommand property of the transformation to:


exec Create_BuyerContractRadiusTerritoryPostalCode_By_BuyerContractId_PostalCode_Radius ?,?,?,?,?

Here is the stored proc I'm calling (which works fine):

ALTER proc [dbo].[Create_BuyerContractRadiusTerritoryPostalCode_By_BuyerContractId_PostalCode_Radius]
@BuyerContractId int,
@PostalCode nvarchar(50),
@Latitude float,
@Longitude float,
@Radius smallint
as
set nocount on
set tran isolation level read uncommitted
insert into BuyerContractRadiusTerritoryPostalCode (BuyerContractId, PostalCode)
select distinct @BuyerContractId, pc.PostalCode
from PostalCode pc
where dbo.CalculateDistance(@Latitude,@Longitude,pc.Latitude,pc.Longitude) <= @Radius
and not exists
(
select bcrtpc.PostalCode
from BuyerContractRadiusTerritoryPostalCode bcrtpc
where bcrtpc.BuyerContractId = @BuyerContractId
and bcrtpc.PostalCode = pc.PostalCode
)

Any help would be greatly appreciated. This is time-sensitive project I'm working on and I really didn't anticipate running into this so I'm kind of scurring for answers. Thanks!