Wavefront .OBJ Import Error I'm getting an error message when I try to import an .OBJ file that I've generated from another .blend file. I'm pretty new to Blender, and I really don't know what it is that the error message is telling me, or how to fix it. Can you help?
That exports and imports perfectly for me, Blender 2.77. However, it's as I suspected, there are a bunch of duplicate vertices which are no doubt causing the error on your end. 

To fix, box select B your entire model, join it into one mesh with CtrlJ, select all with CtrlA, open special menu W and select Remove Doubles. Finally, select everything again in edit mode and use P > Separate by loose parts. You will have to reassign any materials, fix origins and groups after but that should fix the problem and give you a clean obj.