Error message

• Notice: Undefined variable: image in image_style_create_derivative() (line 753 of /var/www/vhosts/pietromillenotti.com/httpdocs/modules/image/image.module).
• Recoverable fatal error: Argument 1 passed to image_scale() must be an instance of stdClass, null given, called in /var/www/vhosts/pietromillenotti.com/httpdocs/modules/image/image.effects.inc on line 111 and defined in image_scale() (line 204 of /var/www/vhosts/pietromillenotti.com/httpdocs/includes/image.inc).