MSDataSetGenerator custom tool returns an error

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Hi,

After installing VS2008 SP1 and Sql Server Compact 3.5 SP1, I couldn't run
custom tool MSDataSetGenerator anymore to generate the dataset classes
(Designer.cs file).

When I build the project or even running the custom tool from the solution
explorer, VS2008 allways shows the message:

"The custom tool 'MSDataSetGenerator' failed. Object reference not set to an
instance of an object."

What should I do?

Thanks in advance.
Best regards,
Hugo
.