error:window ".frame.notebook.page3.frame.frame.frame1.frame.pane" isn't packed
 at C:/Perl/site/lib/Tk/Widget.pm line 1218, <PLUGINS> line
39.
 at C:/Perl/site/lib/Tk/After.pm line 90

Tk::Error: window ".frame.notebook.page3.frame.frame.frame1.frame.pane" isn't pa
cked at C:/Perl/site/lib/Tk/Widget.pm line 1218, <PLUGINS> l
ine 39.
 at C:/Perl/site/lib/Tk/After.pm line 90
 Tk callback for pack
 Tk::After::once at C:/Perl/site/lib/Tk/After.pm line 90
 [once,[{},after#38,idle,once,[{},packscrollbars]]]
 ("after" script)