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How to correct this notice: "sketch is not fully defined"?

unable to extrude on the original two dimention sketch
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Answers
Unable to extrude on two D sketch. notice" sketch is not fully defined"?
You may want to start with the profile inspecter to make sure there is s closed area to extrude a solid.
Try the Onshape courses to get to grips with the basics.
https://learn.onshape.com/
I've done several Onshape courses, including from the learning center here, and haven't run across troubleshooting that specific message ("sketch is not fully defined") anywhere. I would appreciate links to where it is discussed - because I see it all the time - and sometimes it affects what I'm doing and sometimes it seems to have no impact
@trenton_haynes631 You can design without fully defined sketches. You risk unexpected behavior after the undefined sketch if you make changes prior to the undefined sketch in the feature tree.
That discussion is quite helpful. Thanks!