Fatal error: Uncaught Error: Interface 'PHPExcel_RichText_ITextElement' not found in /var/www/testing/PHPExcel_1.7.8/Classes/PHPExcel/RichText/TextElement.php:34 Stack trace: #0 {main} thrown in /var/www/testing/PHPExcel_1.7.8/Classes/PHPExcel/RichText/TextElement.php on line 34