Tk::Error: Can't locate object method "add_chart" via package "Spreadsheet::WriteExcel::Worksheet" at C:\perl\KDC_v3charts.pl line 1352.
main::analysis at C:\perl\KDC_v3charts.pl line 1352
Tk callback for .button4
Tk:__ANON__ at C:/Perl/site/lib/Tk.pm line 250
Tk::Button::butUp at C:/Perl/site/lib/Tk/Button.pm line 175
<ButtonRelease-1>
<command bound to event>