Chart::Plot::Annotated Problem

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Bareword "Chart::Plot::Annotated::_DataPt" not allowed while "strict s
+ubs" in use at Annotated.pm line 14.
BEGIN not safe after errors--compilation aborted at Annotated.pm line 
+131.

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package Chart::Plot::Annotated;

...

  # error-reporting
  get_set => [ '_problem' ];

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Can't locate object method "new" via package "Chart::Plot::Annotated::_DataPt" (perhaps you forgot to load "Chart::Plot::Annotated::_DataPt"?) at /usr/local/lib/perl5/site_perl/5.8.6/Chart/Plot/Annotated.pm line 48.

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