>arEvent["CALLBACK"]>Array
(
    [FROM_MODULE_ID] => main
    [MESSAGE_ID] => OnPageStart
    [CALLBACK] => 
    [SORT] => 100
    [FULL_PATH] => 
    [VERSION] => 2
    [TO_NAME] => ::
)
<

>$args>Array
(
)
<

[TypeError] 
call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given (0)
/home/c/cv18455/siteProject/bitrix/modules/main/classes/general/module.php:469
#0: ExecuteModuleEventEx(array)
	/home/c/cv18455/siteProject/bitrix/modules/main/include.php:185
#1: require_once(string)
	/home/c/cv18455/siteProject/bitrix/modules/main/include/prolog_before.php:19
#2: require_once(string)
	/home/c/cv18455/siteProject/bitrix/modules/main/include/prolog.php:10
#3: require_once(string)
	/home/c/cv18455/siteProject/bitrix/header.php:1
#4: require(string)
	/home/c/cv18455/siteProject/sites/btk-russia.ru/catalog/index.php:1
#5: include_once(string)
	/home/c/cv18455/siteProject/bitrix/modules/main/include/urlrewrite.php:184
#6: include_once(string)
	/home/c/cv18455/siteProject/bitrix/urlrewrite.php:2
----------