[ArgumentCountError] 
Too few arguments to function CAllMain::SetPageProperty(), 1 passed in /home/bitrix/www/community/seminars/inter_sem.php on line 3 and at least 2 expected (0)
/home/bitrix/www/bitrix/modules/main/classes/general/main.php:470
#0: CAllMain->SetPageProperty(string)
	/home/bitrix/www/community/seminars/inter_sem.php:3