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What does it mean? what do I have to do to fix it?...

that error are not a open edge errorCKY2K wrote:usually its because theres an open edge, though it does not say open edge, its usually the case.
hek tutorial wrote:This is typically caused by faces or surfaces that are duplicated or shared between objects.
The faces have shared vertices and\or faces. The objects should either be separated or merged.
A good example would be 2 identical cubes that have been moved together such that they each share one side. The cubes should either be moved apart, or merged together which would include the removal of any duplicate or illegal faces.