SSIS execution using dtexec fails

Hi

We have both SQL Server 2005 & 2008 and I have an SSIS package created in BIDS 2008.
I also have a stored procedure where i execute the SSIS package from SQL2008.
Code:
dtexec /sql "FinancialCalendar" /ser SERVERNAME\sql2008 /MAXCONCURRENT " -1" /set \package.variables[User::StartDt].Properties[Value];20110501 /set \package.variables[User::EndDt].Properties[Value];20110601

When I execute this stored procedure with the above code these are the results I get: 

Microsoft (R) SQL Server Execute Package Utility
Version 9.00.3042.00 for 32-bit   <------ The ssis package is version 10 but its showing version 9
Copyright (C) Microsoft Corp 1984-2005. All rights reserved.
NULL
Started:  9:06:47 AM
Could not load package "FinancialCalendar" because of error 0xC0014062.
Description: The LoadFromSQLServer method has encountered OLE DB error code 0x80040E14 (Could not find stored procedure 'msdb.dbo.sp_dts_getpackage'.).  The SQL statement that was issued has failed.
Source:
Started:  9:06:47 AM
Finished: 9:06:47 AM
Elapsed:  0.265 seconds

When I execute the dtexec command from command prompt it runs correctly anf it shows version 10. How do I resolve this?

Any help would be appreciated.
Thanks.

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Wendy B