The OpenSubdiv Catmull-Clark subdivision method cannot be applied to non-manifold geometry

[Anonymous]

hi i get this when i open my scene // Warning: The OpenSubdiv Catmull-Clark subdivision method cannot be applied to non-manifold geometry. pose:hands_UV_UVShapeDeformed will use "Maya Catmull-Clark" subdivision method for Smooth Mesh Preview. // 

[jmreinhart]

What is your question?