You don't show me line 270, so I am guessing here; but I suspect that it reads some thing like:

my $label_frame = Tk::Lableframe::new();
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There are two bits here:

• The name of the package is Tk::LabelFrame (emphasis added)
• Your use statement is for Tk::LabFrame; both modules exist in CPAN.

Update: fixed typo, thanks SuicideJunkie.