Fatal error: Uncaught Error: Undefined constant "STDIN" in /var/www/erp/spreadsheet/vendor/symfony/process/Tests/PipeStdinInStdoutStdErrStreamSelect.php:17 Stack trace: #0 {main} thrown in /var/www/erp/spreadsheet/vendor/symfony/process/Tests/PipeStdinInStdoutStdErrStreamSelect.php on line 17