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Solidworks 2012 behavior (See red message on Assembly and drawing)

Question asked by Chika Co on Jan 13, 2017
Latest reply on Jan 16, 2017 by Chika Co

I had a complicated assembly.  Everything looks fine.  No warning no error on the assembly and drawing.  When I modified the drawing yesterday, I hide a decal sketch on the drawing.  That was all I did and saved the drawing.  When I open the assembly and drawing today, there are red error messages on my assembly and drawing.  I don't know what happen so I reboot my PC and that did not fix it.  Solidworks 2012 scares me. .  Any advice how to fix this please?  Thank you