If you have already uploaded the file then the name may be misspelled or it is in a different folder.You may get a 404 error for images because you have Hot Link Protection turned on and the domain is not on the list of authorized domains.
When you encounter a 404 error in Word Press, you have two options for correcting it.
If your blog is showing the wrong domain name in links, redirecting to another site, or is missing images and style, these are all usually related to the same problem: you have the wrong domain name configured in your Word Press blog.
The .htaccess file contains directives (instructions) that tell the server how to behave in certain scenarios and directly affect how your website functions.
If you go to your temporary url ( and get this error, there maybe a problem with the rule set stored in an .htaccess file.
You can try renaming that file to .htaccess-backup and refreshing the site to see if that resolves the issue.
It is also possible that you have inadvertently deleted your document root or the your account may need to be recreated.
Either way, please contact your web host immediately. See the Section on 404 errors after clicking a link in Word Press.
On platforms that enforce case-sensitivity PNG and png are not the same locations.
When working with Word Press, 404 Page Not Found errors can often occur when a new theme has been activated or when the rewrite rules in the .htaccess file have been altered.