When adding a "server info" image to a screen I get these errors:

• Use of undefined constant S_NUMBER_OF_EVENTS - assumed 'S_NUMBER_OF_EVENTS'[/var/www/zabbix/include/classes/cserverinfo.mod.php:69]
• Undefined index: events_count[/var/www/zabbix/include/classes/cserverinfo.mod.php:69]
• Use of undefined constant S_NUMBER_OF_ALERTS - assumed 'S_NUMBER_OF_ALERTS'[/var/www/zabbix/include/classes/cserverinfo.mod.php:70]
• Undefined index: alerts_count[/var/www/zabbix/include/classes/cserverinfo.mod.php:70]

in the image it goes wrong too:
ZABBIX Server info
Updated: Sat, 27 Sep 2008 22:33:52 +0200
Refreshed every: 30 sec (refresh now)
Users (online): 4(1)
Logged in as Admin
ZABBIX server is running
Hosts (m/n/t/d): 23(16/0/7/0)
Items (m/d/n)[t]: 1060(441/440/179)[0]
Triggers (e/d)[t/u/f]: 215(209/6)[0/2/207]
S_NUMBER_OF_EVENTS:
S_NUMBER_OF_ALERTS: