niente,
ho impostato i permessi a 777 sulla cartella dove risiedono le immagini ma all'eliminazione mi appare il seguente errore

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, postmaster and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.