I have a bit of a situation where I'm trying to load in a ogre mesh file, and it returns with the error 'T4628: Attribute normals does not exists in vertexBuffer'. I used the OgreXmlConverter to create a .mesh.xml file from the designated .mesh file. The file does contains normals, And the error occurs both in the lib & viewer.
see attachment for an example file.
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example model file
see https://github.com/assimp/assimp/issues/153