This error pops up while printing, e-transmitting when opening a file that has Civil 3D objects. And it only happens after installing the Civil 3D object enablers for 2014.
I recommend you uninstall of if your AutoCAD versions, then reinstall in chronological order making sure to install all the updates/sp's at each version install. That should solve it
that didn't work. I belive it has something to do with xref files with civil 3d objects that have not been saved to 2013 format. Once you open the civil 3d xref, save it, close it, then reopen the sheet the error is gone.
This is what I have found:
1. It only happens in plain AutoCAD AFTER installing the Object Enablers for Civil 3D.
2. All of the files that have the issue were still in 2010 DWG format (Civil 3D 2012 format).
3. They all had a Civil 3D profile in them!
4. Once you open the file in 2014 and save to 2013 DWG format the error goes away.
5. I have reported this to Autodesk
https://docs.google.com/spreadsheet/ccc?key=0AkU45UfGj3hFdFdWeTJYOC1JRXRmWVNWR2JFcWRUT0E&usp=sharing