Coding problem: $PAGE->context was not set. You may have forgotten to call require_login() or $PAGE->set_context(). The page may not display correctly as a result

• line 453 of /lib/pagelib.php: call to debugging()
• line 1502 of /lib/pagelib.php: call to moodle_page->magic_get_context()
• line 1819 of /lib/setuplib.php: call to moodle_page->initialise_theme_and_output()
• line 36 of /mod/newsletter/index.php: call to bootstrap_renderer->__call()