diff --git a/course/modduplicate.php b/course/modduplicate.php
index b4d593b4e01..e8c5c1b3a43 100644
--- a/course/modduplicate.php
+++ b/course/modduplicate.php
@@ -61,13 +61,8 @@ $a->modtype = get_string('modulename', $cm->modname);
 $a->modname = format_string($cm->name);
 
 if (!plugin_supports('mod', $cm->modname, FEATURE_BACKUP_MOODLE2)) {
-    echo $output->header();
-    echo $output->notification(get_string('duplicatenosupport', 'core', $a));
-    echo $output->continue_button(
-        new moodle_url('/course/view.php#section-' . $cm->sectionnum, array('id' => $course->id))
-    );
-    echo $output->footer();
-    die;
+    $url = new moodle_url('/course/view.php#section-' . $cm->sectionnum, array('id' => $course->id));
+    print_error('duplicatenosupport', 'error', $url, $a);
 }
 
 // backup the activity
diff --git a/lang/en/error.php b/lang/en/error.php
index 7ad032cec31..b9e57071480 100644
--- a/lang/en/error.php
+++ b/lang/en/error.php
@@ -204,6 +204,7 @@ $string['dmlwriteexception'] = 'Error writing to database';
 $string['downgradedcore'] = 'ERROR!!!  The code you are using is OLDER than the version that made these databases!';
 $string['downloadedfilecheckfailed'] = 'Downloaded file check failed';
 $string['duplicatefieldname'] = 'Duplicate field name "{$a}" detected';
+$string['duplicatenosupport'] = '\'{$a->modname}\' activity could not be duplicated because the {$a->modtype} module does not support backup and restore.';
 $string['duplicateparaminsql'] = 'ERROR: duplicate parameter name in query';
 $string['duplicaterolename'] = 'There is already a role with this name!';
 $string['duplicateroleshortname'] = 'There is already a role with this short name!';
diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index 1aae903d93e..af23c90f27a 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -487,7 +487,6 @@ $string['duplicate'] = 'Duplicate';
 $string['duplicateconfirm'] = 'Are you sure you want to duplicate {$a->modtype} \'{$a->modname}\' ?';
 $string['duplicatecontcourse'] = 'Return to the course';
 $string['duplicatecontedit'] = 'Edit the new copy';
-$string['duplicatenosupport'] = '\'{$a->modname}\' activity could not be duplicated because the {$a->modtype} module does not support backup and restore.';
 $string['duplicatesuccess'] = '{$a->modtype} \'{$a->modname}\' has been duplicated successfully';
 $string['duplicatinga'] = 'Duplicating: {$a}';
 $string['edhelpaspellpath'] = 'To use spell-checking within the editor, you MUST have <strong>aspell 0.50</strong> or later installed on your server, and you must specify the correct path to access the aspell binary.  On Unix/Linux systems, this path is usually <strong>/usr/bin/aspell</strong>, but it might be something else.';