Shutdown bug?

[FlameInYourSide]

I have a macro called SD_Computer.

Code:

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shutdown 3 0 "" 30 "QM Shutdown Action"

When I try and run it, I get the error message:
Error (RT) in SD_Computer: invalid argument value

There is no indication of which value is invalid.

According the the help info, the 0 flag can be used with the 3 action, but it appears otherwise...

Many thanks for the help!