#27 Preferences menu item gives error

[aslamK]

Clicking Preferences in the Edit menu reselts in the following error:

(regexxer:27884): glibmm-CRITICAL **: 14:24:00.584:
unhandled exception (type Glib::Error) in signal handler:
domain: gtk-builder-error-quark
code : 11
what : /usr/share/regexxer/prefdialog.ui:28:37 Invalid property: gtkmm__GtkDialog.has_separator