or download this
Tk::Error: Unable to read catalog since no file specified and no defau
+lt known. at /some/dir/perl/lib/perl5/Astro/Catalog.pm line 842.
Tk callback for .toplevel1.frame1.menubutton.menu
...
Tk::Menu::Invoke at /some/dir/perl/lib/perl5/x86_64-linux-thread-mult
+i/Tk/Menu.pm line 532
<ButtonRelease>
(command bound to event)