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

line 460 of /public/lib/classes/output/theme_config.php: call to debugging()
line 1867 of /public/lib/pagelib.php: call to core\output\theme_config::load()
line 108 of /public/lib/classes/output/bootstrap_renderer.php: call to moodle_page->initialise_theme_and_output()
line 394 of /public/login/index.php: call to core\output\bootstrap_renderer->__call()

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