KBA: You receive an error message after you install SQL Server 2005 Service Pack 2 when you try to edit a Script component that is inside an SSIS package and the SSIS package was created in an earlier version of SQL Server 2005
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition & Standard Edition
Notification Contents: New and Major Modifications
You receive an error message after you install SQL Server 2005 Service Pack 2 when you try to edit a Script component that is inside an SSIS package and the SSIS package was created in an earlier version of SQL Server 2005
http://support.microsoft.com/kb/938608/en-US