Fatal error: Uncaught Error: Interface "App\Export\Spreadsheet\CellFormatter\CellFormatterInterface" not found in /home/palabrebel/www/kimai/src/Export/Spreadsheet/CellFormatter/BooleanFormatter.php:15 Stack trace: #0 {main} thrown in /home/palabrebel/www/kimai/src/Export/Spreadsheet/CellFormatter/BooleanFormatter.php on line 15