Meaning: A trench run was created or modified in such a way that a trench turn feature's previous and next straight features overlap.
Recovery:
-
Select the trench turn feature in error.
-
Increase 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 values in the Properties View so that the inside lengths of the previous and next straight runs do not overlap.