Messaggio di errore

• Warning: date_timezone_set() expects parameter 1 to be DateTime, boolean given in format_date() (linea 2063 di /var/www/html/cd_20151217/includes/common.inc).
• Warning: date_format() expects parameter 1 to be DateTimeInterface, boolean given in format_date() (linea 2073 di /var/www/html/cd_20151217/includes/common.inc).