When submitting exam, can't find page (?)

I have a simple 5 question exam. I get this message when I try to submit the exam:

The page cannot be found

The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.

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Please try the following:

• Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.

• If you reached this page by clicking a link, contact the Web site administrator to alert them that the link is incorrectly formatted.

• Click the Back button to try another link.

HTTP Error 404 - File or directory not found.

Internet Information Services (IIS)

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Technical Information (for support personnel)

• Go to Microsoft Product Support Services and perform a title search for the words HTTP and 404.

• Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Web Site Setup, Common Administrative Tasks, andAbout Custom Error Messages.

Some background:

Publishing using Coursemill ver. 3

Any ideas? Thanks, all.