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QueryInterface for interface DTS.CustomTask failed
By Darren Green
Version 2000
Level Beginner

When developing a custom task or just manipulating the DTS objects through .Net you may recive the following error:

QueryInterface for interface DTS.CustomTask failed

This error has been fixed in SQL Server 200 Service Pack 2. Make sure you apply the service pack to the SQL Server machine, and any client machines that will be running the .Net code, since DTS is a client side tool.