It might be linked to this tread https://forum.freecadweb.org/viewtopic.php?p=317427 since I created that file with recent development version. It writes some extra info in the file that old version does not understand and ignores. I tried opening the file with
OS: Windows 8.1
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Bulgarian/Bulgaria (bg_BG)
and got the same errors. But saving the file with that version and reopening it clears the errors. So they should be safely ignored...
A difficult subtraction in Part Design
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Re: A difficult subtraction in Part Design
Ok, thanks.