rem: KMessageBox::error(knGlobals.topWidget, i18n("Unable to load/save file!"));
add: KMessageBox::error((w!=0)? w : knGlobals.topWidget, i18n("Unable to load/save file!"));
context: void displayExternalFileError(){  KMessageBox::error(knGlobals.topWidget, i18n("Unable to load/save file!"));}