Fatal error: Uncaught Error: Interface "renderable" not found in C:\Apache24\htdocs\moodle\course\format\tests\fixtures\format_theunittest_output_course_format_invalidoutput.php:30 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\course\format\tests\fixtures\format_theunittest_output_course_format_invalidoutput.php on line 30