Подскажите, ошибки "Warning: session_start() [function.session-start]:"

Warning: session_start() [function.session-start]: 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 'America/New_York' for 'EDT/-4.0/DST' instead in /install/index.php on line 42

Warning: session_start() [function.session-start]: SAFE MODE Restriction in effect. The script whose uid is 802 is not allowed to access /tmp owned by uid 0 in install/index.php on line 42

Warning: session_start() [function.session-start]: 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 'America/New_York' for 'EDT/-4.0/DST' instead in /install/index.php on line 42

Fatal error: session_start() [<a href='function.session-start'>function.session-start</a>]: Failed to initialize storage module: files (path: ) in /install/index.php on line 42