[ArgumentCountError] 
Too few arguments to function CAllMain::SetPageProperty(), 1 passed in /home/bitrix/www/energoconference/exhibition/welcome/index.php on line 3 and at least 2 expected (0)
/home/bitrix/www/bitrix/modules/main/classes/general/main.php:471
#0: CAllMain->SetPageProperty(string)
	/home/bitrix/www/energoconference/exhibition/welcome/index.php:3