Cannot offset non-planar objects?

[taneum]

So upon opening a sheet drawing, I get this message repeatedly in my command prompt reading over and over again until the drawing opens.  What would this be referring to?  My drawing has a couple xref's in it and one of the xref's does have Civil 3D objects in it (alignment, profile, assembly, corridor, pipe network)

See below:

ot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
Cannot offset non-planar objects.
AutoCAD menu utilities loaded.
Command:

Autodesk DWG. This file is a TrustedDWG last saved by an Autodesk application or Autodesk licensed application.

Command

[tcorey]

Post your drawing...

[sdl051]

I'm getting this same message while trying to edit (on/off) a .dgn reference file layers. The reference is a large Aerial Maping dgn and C3D 2014 is hanging on the process.

[alma.jacobs]

Try AUDIT, this seemed to fix the issue for me. In my case some lines that I had from a .dgn file had elevations assigned to them and ACAD was not able process those elevations. During the audit, the lines were placed on elevation 0.