messages warning

j’ai un problème je ne sais que faire, c’est ces messages qui s’affichent

Warning : date() [function.date] : It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ’Europe/Berlin’ for ’CEST/2.0/DST’ instead in /var/www/vhosts/rodaddhd.org/httpdocs/ecrire/inc/log.php on line 62

Warning : date() [function.date] : It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ’Europe/Berlin’ for ’CEST/2.0/DST’ instead in /var/www/vhosts/rodaddhd.org/httpdocs/ecrire/inc/log.php on line 62

Warning : date() [function.date] : It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ’Europe/Berlin’ for ’CEST/2.0/DST’ instead in /var/www/vhosts/rodaddhd.org/httpdocs/ecrire/inc/log.php on line 62

Fatal error : Cannot redeclare echapper_php_callback() (previously declared in /var/www/vhosts/rodaddhd.org/httpdocs/ecrire/public/parametrer.php:63) in /var/www/vhosts/rodaddhd.org/httpdocs/ecrire/public/sandbox.php on line 159

Aidez moi s’il vous plait