The textures on those images are horribly stretched. The room itself is rather boxy. It doesn't match the machine (or whatever it is) in the middle of it.
Get rid of the capital letter in the name. Secondly, this isn't the full compile log. No errors are present in this one. Check out this site for a comprehensive explanation of most possible errors in HL and Hammer.
Click the Clip button and the white box will change. Click it until the whole brush is surrouned by white and then hit enter. The brush will split and both sides will stay.