Couldn't open .\charts\run_chart.bin in add_chart_ext():
    No such file or directory.
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The particular error message that is being reported, "Chart type 'External' not supported in add_chart()" is generated when you try to add a chart type that doesn't exist via add_chart() (and not from add_chart_ext() as report by the OP):

    my $chart = $workbook->add_chart( type => 'foo' );
    ...
    Chart type 'Foo' not supported in add_chart()
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Confused? I am and I wrote the module. Hopefully the stack trace will clear things up a bit.

Update: I was wrong about this. The External.pm module is loaded using the same factory method as the other Chart modules. I was clearly smoking a bit too much Java at the time I wrote it.

--
John.

However, there is an 'External' chart module (albeit invalid in this case) so if a program inadvertently tried to load it it would generate another different error message. As such I cannot see any way that particular error message can be generated.

Confused? I am and I wrote the module. Hopefully the stack trace will clear things up a bit.

Yup. It probably means Spreadsheet/WriteExcel/Chart/External.pm was not copied/packed by cava for whatever reason

Hello again,

Sorry for my late reply, I'm rather busy at the moment. Anyhow, below is the error message I receive after inluding Devel::SimpleTrace. I'm not able to judge whether this makes things more clear or not but hopefully you are.

Chart type 'External' not supported in add_chart()
    at Spreadsheet::WriteExcel::Chart::factory(unknown source)
    at Spreadsheet::WriteExcel::Workbook::add_chart_ext(Spreadsheet/Wr
+iteExcel/Workbook.pm:560)
    at analyse_step::generate_report_excel(cavaexecscript/analyse_step
+.pm:679)
    at main::save_report(cavaexecscript/csct.pl:1011)
    at main::__ANON__(cavaexecscript/csct.pl:376)
    at <eval>(Tkx.pm:343)
    at Tkx::i::DoOneEvent(Tkx.pm:343)
    at Tkx::MainLoop(Tkx.pm:56)
    at <eval>(cavaexecscript/csct.pl:707)
    at Cava::Pack::Code::_run_packaged_script(<Packaged Modules>/Appli
+cation::Loader:1456)
    at Cava::Pack::Code::_run_doscript(<Packaged Modules>/Application:
+:Loader:1483)
    at main::(<Packaged Modules>/Application::Loader:1523)

Chart type 'External' not supported in add_chart()
    at Spreadsheet::WriteExcel::Chart::factory(unknown source)
    at Spreadsheet::WriteExcel::Workbook::add_chart_ext(Spreadsheet/Wr
+iteExcel/Workbook.pm:560)
    at analyse_step::generate_report_excel(cavaexecscript/analyse_step
+.pm:679)
    at main::save_report(cavaexecscript/csct.pl:1011)
    at main::__ANON__(cavaexecscript/csct.pl:376)
    at <eval>(Tkx.pm:343)
    at Tkx::i::DoOneEvent(Tkx.pm:343)
    at Tkx::MainLoop(Tkx.pm:56)
    at <eval>(cavaexecscript/csct.pl:707)
    at Cava::Pack::Code::_run_packaged_script(<Packaged Modules>/Appli
+cation::Loader:1456)
    at Cava::Pack::Code::_run_doscript(<Packaged Modules>/Application:
+:Loader:1483)
    at main::(<Packaged Modules>/Application::Loader:1523)

    while executing
"::perl::CODE(0x30239ec)"
    invoked from within
".n.f3.l3.b2 invoke "
    invoked from within
".n.f3.l3.b2 instate {pressed !disabled} { .n.f3.l3.b2 state !pressed;
+ .n.f3.l3.b2 invoke } "
    (command bound to event)
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I would very much appreciate if you have any ideas on how to fix this issue! Thanks!