Fatal error: Uncaught Error: Interface "PhpOffice\PhpSpreadsheet\IComparable" not found in /home/simpletemp/public_html/cmm-ghg/calculator/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/RichText/RichText.php:10 Stack trace: #0 {main} thrown in /home/simpletemp/public_html/cmm-ghg/calculator/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/RichText/RichText.php on line 10