Fatal error: Uncaught Error: Class 'Text_Diff_Renderer' not found in /home/app/htdocs/lidia/vendor/cerdic/css-tidy/testing/unit-tests/class.Text_Diff_Renderer_parallel.php:7 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/cerdic/css-tidy/testing/unit-tests/class.Text_Diff_Renderer_parallel.php on line 7