About 404 error page
404 error page shows that a file or directory which you are requesting is not exist in the server. The 404 error generate because of two reasons:
a) May be you have broken the link in your HTML page. Make sure and check the all your HTML files are link to the right/accurate files or directories.
b) May be you have misspelled your file name or directory name. Make sure and check the URL that is entered the spell of file name or directory name correctly.