Error Creating a Sweep: Circular Chain of References?

[chodosh]

Trying to create a simple rectangular sweep, we go this message and don't know what it means or what to do:

"Constraints in sketches of highlighted elements cause a circular chain of references."

In the journal file, this was preceded by:

Closing more blocks than exist!
0:< DBG_WARN: can't make block depth negative!

Does anyone know if this related to the direction of the path? We tried redrawing the path, still couldn't get it to work without getting the first warning. The sketch was stuck in a loop, you couldn't get out of sketch mode for the sweep without deleting either the path and canceling or the profile and cancelling. Is there something we were doing wrong with our properties for the sweep? What makes a cicular reference in a sweep?

Thanks for your help!

All the best,
LC

[Dimitri Harvalias]

Make sure the void doesn't turn on itself, i.e. cross it's own path, as it moves along the sweep. This can happen when you are dealing with tight turns or acute angles in the path.