-$OUTPUT->add_label('nosubject', 'nosenderwarning', 'norecipientwarning', 'nosubjectwarning',
- 'nobodywarning', 'notsentwarning', 'savingmessage', 'sendingmessage', 'messagesaved',
- 'converting', 'editorwarning', 'searching');
+$OUTPUT->add_label('nosubject', 'nosenderwarning', 'norecipientwarning', 'nosubjectwarning', 'cancel',
+ 'nobodywarning', 'notsentwarning', 'notuploadedwarning', 'savingmessage', 'sendingmessage',
+ 'messagesaved', 'converting', 'editorwarning', 'searching', 'uploading', 'fileuploaderror');