diff --git a/backup/moodle2/restore_format_topcoll_plugin.class.php b/backup/moodle2/restore_format_topcoll_plugin.class.php
index f392160..0f2525a 100644
--- a/backup/moodle2/restore_format_topcoll_plugin.class.php
+++ b/backup/moodle2/restore_format_topcoll_plugin.class.php
@@ -87,7 +87,7 @@ public function process_topcoll($data) {
         $data->courseid = $this->task->get_courseid();
 
         if (!($course = $DB->get_record('course', array('id' => $data->courseid)))) {
-            print_error('invalidcourseid', 'error');
+            throw new \moodle_exception('invalidcourseid', 'error');
         } // From /course/view.php.
         $courseformat = course_get_format($course);
 
diff --git a/classes/output/renderer.php b/classes/output/renderer.php
index 3903df2..e8a25fb 100644
--- a/classes/output/renderer.php
+++ b/classes/output/renderer.php
@@ -663,7 +663,7 @@ public function single_section_page($displaysection) {
         if (!($thissection = $modinfo->get_section_info($displaysection))) {
             /* This section doesn't exist or is not available for the user.
                We actually already check this in course/view.php but just in case exit from this function as well. */
-            print_error('unknowncoursesection', 'error', course_get_url($course),
+            throw new \moodle_exception('unknowncoursesection', 'error', course_get_url($course),
                 format_string($course->fullname));
         }
 
diff --git a/settopcollpref.php b/settopcollpref.php
index a47fed5..466e1dd 100644
--- a/settopcollpref.php
+++ b/settopcollpref.php
@@ -38,7 +38,7 @@
 // Get the name of the preference to update, and check that it is allowed.
 $name = required_param('pref', PARAM_RAW);
 if (!isset($USER->ajax_updatable_user_prefs[$name])) {
-    print_error('notallowedtoupdateprefremotely');
+    throw new \moodle_exception('notallowedtoupdateprefremotely');
 }
 
 // Get and set the value.
@@ -46,7 +46,7 @@
 // Update.
 if ($value) {
     if (!set_user_preference($name, $value)) {
-        print_error('errorsettinguserpref');
+        throw new \moodle_exception('errorsettinguserpref');
     }
     echo 'OK';
 } else {