PHP Notice that obscures log file with numerous messages

[spinozarabel]

Get the following notice when debug is ON.

PHP Notice: Invalid get_string() identifier: 'settings_confighiddencourses' or component 'block_grade_me'. Perhaps you are missing $string['settings_confighiddencourses'] = ''; in /var/www/html/sritoni/blocks/grade_me/lang/en/block_grade_me.php?

• line 353 of /lib/classes/string_manager_standard.php: call to debugging()
• line 7283 of /lib/moodlelib.php: call to core_string_manager_standard->get_string()
• line 26 of /blocks/grade_me/settings.php: call to get_string()
• line 99 of /lib/classes/plugininfo/block.php: call to include()
• line 81 of /admin/settings/plugins.php: call to core\plugininfo\block->load_settings()
• line 8857 of /lib/adminlib.php: call to require()
• line 19 of /admin/settings.php: call to admin_get_root()

in /var/www/html/sritoni/lib/weblib.php on line 3257, referer: https://hset.in/sritoni/admin/settings.php?section=debugging