This sounds like a hyperlink or url issue. Try to make sure that the page is spelled correctly, and then try typing it in the address bar. Also, try this:
1. double click on the page in FrontPage
2. Go to the "Browse" icon and try browsing the page alone using either IE or firefox.
If the page error comes up, then you have something wrong in the code of the page. If you like, submit the code and we can look at it for you to determine if that might be the issue.
-Joey