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[ChristopherHinkley]

I am currently using Civil 3D 2015 and started getting this message yesterday (see attached image).  It happens when I make minor changes, save the file and proceed to exit out of Civil 3D.

If anyone has any advice on the issue I would greatly appreciate at it.

Thanks for your time

Chris H

[KirkWM]

I think this has to do with "round-tripping" between sort of "compatible" C3D generations (2013 to 2016 I think). Seems like something was originally created in an older version of C3D and may be opening up, or using a DREF, within a newer version.

[ChristopherHinkley]

Thanks for taking the time to reply.


I have Civil 3D 2015 and Civil 3D 2017 on my machine. I have only opened the "BAS" file in Civil 3D 2015. I typically use two base files "SRV" (existing) and "BAS" (proposed).


However, I made a copy of the .dwg file and ran a test in Civil 3D 2017 and everything is working correctly.


Chris H