Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\Calculation\Engine\Operands\Operand" not found in /home/romafi/cofortest/php/php-spreadsheet/src/PhpSpreadsheet/Calculation/Engine/Operands/StructuredReference.php:12 Stack trace: #0 {main} thrown in /home/romafi/cofortest/php/php-spreadsheet/src/PhpSpreadsheet/Calculation/Engine/Operands/StructuredReference.php on line 12