Thanks, that is what I did and the problem has gone away.
Hello Destac. Thank you for your reply. I wish I could answer whether the file existed previously or not but I only noticed the problem when I tried the pingdom tool to see how my page load speed was. Could I use some sort of redirect?
If I have understood this correctly then this plug in is not going to work correctly if I am using W3 Total cache. That’s a pity but thanks anyway for your help.