Ca ressemble bien à un problème de droits... L'application ne peut certainement pas "lire" le dossier qui contient tes fichiers.
Tu peux toujours essayer quelque chose du style :
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You're going to need write permissions to that directory, one way or another. I believe Sublime Text just runs/saves as your user.
You could add yourself to the _www group and make /Library/WebServer/Documents/ group writeable (chmod 775 /Library/WebServer/Documents/).
Apache only needs to read from that directory (unless you're doing something like uploading images, saving state files, etc). So if apache and other users on your computer don't need to write to that directory, it's fine to make it owned by you (chown $USER /Library/WebServer/Documents/).
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Source : ici
Peux-tu nous donner plus d'informations concernant les fichiers que tu souhaites modifier ainsi que leurs droits ?
Cordialement,
M. (#mLF)