Fatal error: Uncaught Error: Class "block_base" not found in /home/edepracl/public_html/moodle30/blocks/glossary_random/block_glossary_random.php:30 Stack trace: #0 {main} thrown in /home/edepracl/public_html/moodle30/blocks/glossary_random/block_glossary_random.php on line 30