Fatal error: Uncaught Error: Class 'block_base' not found in /home/junior47895/public_html/aulavirtual/AulaVirtual_22Apr/blocks/course_summary/block_course_summary.php:25 Stack trace: #0 {main} thrown in /home/junior47895/public_html/aulavirtual/AulaVirtual_22Apr/blocks/course_summary/block_course_summary.php on line 25