Mysterious php session error

FATAL ERROR: MODX Setup cannot continue.

Make sure your PHP session configuration is valid and working.

[Session]
;session.bug_compat_42 = Off
;session.bug_compat_warn = Off
session.bug_compat_42 = 0
session.bug_compat_warn = 1
session.auto_start = 0
session.cache_limiter = nocache
session.cache_expire = 180

url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"
session.name = canadianworldmusic
session.use_only_cookies = 1
session.serialize_handler = php
session.cookie_path = /
session.entropy_length = 0
session.entropy_file =
session.gc_probability = 1
session.gc_divisor = 1000
session.cookie_domain =
session.cookie_httponly =
;session.gc_maxlifetime = 43400
session.gc_maxlifetime = 1440
session.referer_check =
session.save_handler = files
session.save_path = "/var/www/vhosts/canadianworldmusic.com/tmp"
session.cookie_lifetime = 0
session.use_cookies = 1
session.use_trans_sid = 0

session.hash_function = 0
session.hash_bits_per_character = 5

/* session loop-back tester */
if (!$isCommandLine && (!isset($_GET['s']) || $_GET['s'] != 'set') && !isset($_SESSION['session_test'])) {
    $_SESSION['session_test']= 1;
    echo "<html><head><title>Loading...</title><script>window.location.href='" . MODX_SETUP_URL . "?s=set';</script></head><body></body></html>";
    exit ();
} elseif (!$isCommandLine && isset($_GET['s']) && $_GET['s'] == 'set' && !isset($_SESSION['session_test'])) {
    die('<html><head><title></title></head><body><h1>FATAL ERROR: MODX Setup cannot continue.</h1><p>Make sure your PHP session configuration is valid and w$
}

/* set manually */
 $_SESSION['session_test']= 1;

/* session loop-back tester */
if (!$isCommandLine && (!isset($_GET['s']) || $_GET['s'] != 'set') && !isset($_SESSION['session_test'])) {
    $_SESSION['session_test']= 1;
    echo "<html><head><title>Loading...</title><script>window.location.href='" . MODX_SETUP_URL . "?s=set';</script></head><body></body></html>";
    exit ();
} elseif (!$isCommandLine && isset($_GET['s']) && $_GET['s'] == 'set' && !isset($_SESSION['session_test'])) {
    die('<html><head><title></title></head><body><h1>FATAL ERROR: MODX Setup cannot continue.</h1><p>Make sure your PHP session configuration is valid and w$
}