Fatal error: Uncaught Error: Call to undefined function PhpOffice\PhpSpreadsheet\Shared\mb_strlen() in E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Shared\StringHelper.php:419 Stack trace: #0 E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php(443): PhpOffice\PhpSpreadsheet\Shared\StringHelper::countCharacters('Worksheet') #1 E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php(865): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet::checkSheetTitle('Worksheet') #2 E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php(321): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->setTitle('Worksheet', false) #3 E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Spreadsheet.php(412): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->__construct(Object(PhpOffice\PhpSpreadsheet\Spreadsheet)) #4 E:\xampp\htdocs\dse_data_sync_imds\1_mkistat.php(29): PhpOffice\PhpSpreadsheet\Spreadsheet->__construct() #5 {main} thrown in E:\xampp\htdocs\dse_data_sync_imds\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Shared\StringHelper.php on line 419