Gareth, thank you for the input. Below is the debug output which was enlightening. Based upon the trace I focused on another plugin that I have installed (simple_clock) which seems to be what is causing the error. When I removed this block the attendance plugin would display. What is odd is that the simple_clock block did display throughout the rest of the site and did not seem to throw an error but did when accessing the attendance module. At the very least I can work around not having the simple_clock plugin which does not seem to be updated for Moodle 4.x.
Debug info:
Error code: generalexceptionmessage
Stack trace:
line 161 of /blocks/simple_clock/block_simple_clock.php: Error thrown
line 337 of /blocks/moodleblock.class.php: call to block_simple_clock->get_content()
line 231 of /blocks/moodleblock.class.php: call to block_base->formatted_contents()
line 1255 of /lib/blocklib.php: call to block_base->get_content_for_output()
line 1313 of /lib/blocklib.php: call to block_manager->create_block_contents()
line 377 of /lib/blocklib.php: call to block_manager->ensure_content_created()
line 2873 of /theme/adaptable/classes/output/core_renderer_toolbox.php: call to block_manager->region_has_content()
line 547 of /theme/adaptable/classes/output/core_renderer_layout.php: call to theme_adaptable\output\core_renderer->blocks()
line 150 of /theme/adaptable/classes/output/core_renderer_layout.php: call to theme_adaptable\output\core_renderer->sidepostheader()
line 723 of /theme/adaptable/classes/output/core_renderer_layout.php: call to theme_adaptable\output\core_renderer->yesheader()
line 31 of /theme/adaptable/layout/columns2.php: call to theme_adaptable\output\core_renderer->columns_two_layout()
line 972 of /lib/classes/output/core_renderer.php: call to include()
line 888 of /lib/classes/output/core_renderer.php: call to core\output\core_renderer->render_page_layout()
line ? of unknownfile: call to core\output\core_renderer->header()
line 130 of /lib/classes/output/plugin_renderer_base.php: call to call_user_func_array()
line 87 of /mod/attendance/manage.php: call to core\output\plugin_renderer_base->__call()