Fatal error: Uncaught Error: Class 'HTMLPurifier_ErrorsHarness' not found in D:\xampp\htdocs\elmontedesion\sis_bib\modelo\htmlpurifier-4.15.0\tests\HTMLPurifier\AttrValidator_ErrorsTest.php:3 Stack trace: #0 {main} thrown in D:\xampp\htdocs\elmontedesion\sis_bib\modelo\htmlpurifier-4.15.0\tests\HTMLPurifier\AttrValidator_ErrorsTest.php on line 3