This page should be using theme alpha which cannot be initialised. Nor can the site theme alpha. Falling back to boost

• line 754 of /lib/outputlib.php: call to debugging()
• line 1859 of /lib/pagelib.php: call to theme_config::load()
• line 761 of /lib/pagelib.php: call to moodle_page->initialise_theme_and_output()
• line 1016 of /lib/pagelib.php: call to moodle_page->magic_get_theme()
• line 166 of /admin/tool/policy/classes/api.php: call to moodle_page->get_renderer()
• line 58 of /admin/tool/policy/classes/api.php: call to tool_policy\api::list_policies()
• line 75 of /admin/tool/policy/classes/output/page_viewalldoc.php: call to tool_policy\api::list_current_versions()
• line 67 of /admin/tool/policy/classes/output/page_viewalldoc.php: call to tool_policy\output\page_viewalldoc->prepare_policies()
• line 39 of /admin/tool/policy/viewall.php: call to tool_policy\output\page_viewalldoc->__construct()