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Have you created a project, or just opened the VHDL files?
You need a project to be able to compile.
BTW: if thats the code that came with the book (johns.vhd) - I would ditch that book and find one that uses much better code examples (the code is quite poor).
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Thanks, that was exactly it, I needed to create a project first. I was able to compile the file. Regarding, johns.vhd, the code is definitely written poorly but it is not from the book, I found it online.
Now that I compiled the file I want to do a functional simulation where I face another problem, as seen below. I searched for that error and one suggested to add file to the top-level. But it is already in top level. Any ideas what is going on?
http://s15.postimg.org/lh4w5p9mz/Error.png
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