[Exception] 
Could not open /home/bitrix/s3/www/library/../../doc/library.xlsx for reading! File does not exist. (0)
/home/bitrix/s3/lib/phpexcel/PHPExcel/Reader/Excel2007.php:235
#0: PHPExcel_Reader_Excel2007->canRead(string)
	/home/bitrix/s3/lib/phpexcel/PHPExcel/IOFactory.php:268
#1: PHPExcel_IOFactory::createReaderForFile(string)
	/home/bitrix/s3/lib/phpexcel/PHPExcel/IOFactory.php:205
#2: PHPExcel_IOFactory::identify(string)
	/home/bitrix/s3/www/library/library.php:13