New to Blender 2.65 but competent in Illustration software. I am following a well known Youtube tutorial and created the lighthouse in the segment. But when I try to apply the Difference Modifier to it to cut a window, I get the error message: Modifiers cannot be applied to multiuser data.
I contacted the tutor and he didn’t know what would cause it. I have a Dell Vostra Windows 7 64-bit machine. The tutor did suggest clicking on the Normals, etc and I have pasted that recalculation at the top of the image under the original ones. I am sorry, but I don’t know what it all meant but it didn’t help!
I am able to apply Modifiers like Difference if I just simply create two cubes or a cube and a sphere, so perhaps there’s something wrong with the lighthouse which was constructed from a circle that was extruded then joined at the top in a peak.
Attached is an image with screenshots of the setup.