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From MoodleDocs

The error means that a new admin page 'foo' (the one you're developing right now) is not registered with the Admin menu. It is triggered with the call:


The solution is to add a reference to the page in the appropriate file in admin/settings/XXX.php. Something like:

$ADMIN->add("parent_section", new admin_externalpage('foo', "Foo Admin Component", "$CFG->wwwroot/$CFG->admin/foo.php"));