Meaning: Because the previous and next straight features of a trench run overlap, Smart 3Dx could not create the trench turn feature between the straight features.
Recovery:
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Select the trench turn feature in error.
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Modify the lengths of the Sketch 3D segments in the Graphic View so that the previous and next straight runs do not overlap.
-OR-
Change the projection dimension values in the Properties View so that the inside lengths of the previous and next straight runs do not overlap.