“Forbidden” ?

Please take a look at this. Godaddy insists this is a scripting issue, but the website has been running just fine for over 6 months! I have not altered the script in any way, but as of today, https://www.comfortgrooming.com says “Forbidden” when you visit it! The actual site is https://www.comfortgrooming.com/index/index.php but when you go there, even more error messages come up. Among the messages is “No such file or directory” but I can clearly see each file via an ftp program so I am very confused as well as discouraged because I just completed the site and I do not know how to backup the content of the pages. Please, any help or advice would be extremely appreciated.