in reply to How to add label?
G'day aydar.pl,
Welcome to the Monastery.
You're dereferencing $main_window in
my $label_of_telephone_or_email = $$main_window->new_ttk__label(...
Just use $main_window directly, i.e. remove the extraneous '$':
my $label_of_telephone_or_email = $main_window->new_ttk__label(...
and the GUI runs normally.
— Ken
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