Fatal error: Uncaught exception 'PHPExcel_Exception' with message 'Cell coordinate can not be zero-length string' in /var/www/vhosts/2/108947/webspace/httpdocs/ideal-sport22.ru/admin/classes/excel/Classes/PHPExcel/Cell.php:555 Stack trace: #0 /var/www/vhosts/2/108947/webspace/httpdocs/ideal-sport22.ru/admin/classes/excel/Classes/PHPExcel/Worksheet.php(1289): PHPExcel_Cell::coordinateFromString('') #1 /var/www/vhosts/2/108947/webspace/httpdocs/ideal-sport22.ru/admin/classes/excel/Classes/PHPExcel/Worksheet.php(1692): PHPExcel_Worksheet->cellExists(NULL) #2 /var/www/vhosts/2/108947/webspace/httpdocs/ideal-sport22.ru/admin/timetable.php(144): PHPExcel_Worksheet->mergeCells('B1:A1') #3 {main} thrown in /var/www/vhosts/2/108947/webspace/httpdocs/ideal-sport22.ru/admin/classes/excel/Classes/PHPExcel/Cell.php on line 555