I’ve spent a little time with Blender (2.78) trying everything I can thing of with combinations of subdivision, solidify and mirrors to try and get the same error but can’t do it. Its a curious problem!
- Do try and see if you can import a normal cube without any problems. If this works, then move some of the vertices of the cube and add the modifiers you’ve listed and see if it still works. This will tell you where the problem probably lies, i.e. is the problem with your particular weapon model, or is it with the exporting-importing pipeline as a whole?
If you can import a cube fine, even with the modifiers on it, the problem is therefore probably with your weapon model…
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save a copy of your weapon model, and simplify it; by deleting bits can you produce something that does export well?
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if your weapon model is made up of multiple objects in Blender (which it looks like it might be, as your screenshot lists a problem with 8 different named meshes), is there any parenting going on within the model?
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can you take a few screenshots of Blender to show the geometry of your model and how the parts of the object are combined?
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when you say high poly, just how high do you mean… ?
(If you’re happy to put up a Blender .blend file for one of the weapon models you’re having trouble with, I’d be happy to look at it and see if I can see any problem.)