Fatal error: Uncaught Error: Call to undefined function mb_check_encoding() in /home/bitrix/www/bitrix/modules/main/classes/general/virtual_io_filesystem.php:253 Stack trace: #0 /home/bitrix/www/bitrix/modules/main/classes/general/virtual_io_filesystem.php(268): CBXVirtualIoFileSystem::ValidateCommon('/bitrix/abtest/...') #1 /home/bitrix/www/bitrix/modules/main/classes/general/virtual_io.php(170): CBXVirtualIoFileSystem->ValidatePathString('/bitrix/abtest/...') #2 /home/bitrix/www/bitrix/modules/main/include/urlrewrite.php(142): CBXVirtualIo->ValidatePathString('/bitrix/abtest/...') #3 /home/bitrix/www/bitrix/urlrewrite.php(2): include_once('/home/bitrix/ww...') #4 {main} thrown in /home/bitrix/www/bitrix/modules/main/classes/general/virtual_io_filesystem.php on line 253