The Skin section has xxxx Error looks like a skin modifier error. But the truth is it want to tell you that some parts of your model is too complex to use one single material. For example if you made a Tank and has many caterpillar tracks and each of them has a complex mesh, this error will happen. The solution is simple, make a new SC2 material (as same as the old one) for some parts of them so that both materials don't reach the vertex limit.
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