One web page not displaying on web hosting server

I have hosted a website with four web pages. The first three web pages are fully developed the other is still under construction. My problem is one of the three web pages is not displaying when I click a link to it. I have noticed that when I click the link to it, the page just flashes as if it's loading then disappears and then shows ...not-found.html on the address bar. I have tried clearing the cache but with no luck.
Please help.

Thanks in advance