MBS-7391: Replace the deprecated print_error by moodle exception

Author: PM84

autologin.php

@@ -31,4 +31,4 @@
 \auth_saml2\auto_login::finish((bool)$success, new moodle_url($url));
 
 // Something strange went wrong, or somebody tried to directly link here.
-print_error('errorinvalidautologin', 'auth_saml2');
+throw new \moodle_exception('errorinvalidautologin', 'auth_saml2');