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I don't see anything in the sample you posted that would cause the error you describe.

That error usually indicates that your included launch file has an <arg> tag without a default value, and you aren't providing a value for that argument. I would check your included launch file for a line like: <arg name="test">.

If you can't find this on your own, please post a complete sample that reproduces the issue; maybe by removing the other parts of the launch file and checking that it still produces the same error.