Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Calculation\Functions' not found in /var/www/html/lib/php-spreadsheet/tests/data/Calculation/Engineering/IMPOWER.php:12 Stack trace: #0 {main} thrown in /var/www/html/lib/php-spreadsheet/tests/data/Calculation/Engineering/IMPOWER.php on line 12