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Debugging "Some external references are missing"
tgunr
Member Posts: 44 ✭✭
After changing a sketch I got a bunch of errors. In one, I got rid of all the red constraints and everything looked fine but still the sketch is still reporting someone MIA. How do you track these down?
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philip_thomas
Member, Moderator, Onshape Employees, Developers Posts: 1,381 
@tgunr - its tricky in any constraint based system.
A single 'square' for instance, has 11 constraints.
A complex sketch could easily have hundreds.
If any 2 conflict, the solver has no idea which 2 are the root cause and there are (usually) multiple solutions.
Tips- Undo the thing that just caused the problem.
- Roll back to an earlier microversion where it was good
- Check that you didn't automatically create a constraint you didn't want (h and v are the two usual guilty parties)
- Use the shift key when dragging entities (prevents new constraints from being added
- Delete suspect constraints (you can always put them back).
Philip Thomas - Onshape6
Answers
Has it lost the sketch plane?
Share a link and we can take a look.
Twitter: @onshapetricks & @babart1977
A single 'square' for instance, has 11 constraints.
A complex sketch could easily have hundreds.
If any 2 conflict, the solver has no idea which 2 are the root cause and there are (usually) multiple solutions.
Tips
- Undo the thing that just caused the problem.
- Roll back to an earlier microversion where it was good
- Check that you didn't automatically create a constraint you didn't want (h and v are the two usual guilty parties)
- Use the shift key when dragging entities (prevents new constraints from being added
- Delete suspect constraints (you can always put them back).
Good luck!IR for AS/NZS 1100
don't forget to check the plane you created the sketch on. If it's no longer there, you'll get an error and will have to re-route the reference to another plane.