Fixed an incorrect error message in the Terrain component.
Fixed an incorrect error message in the Terrain component.

paroj/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,RealityFactory/ogre