I applied the following patch and could then generate a graph.

--- ./Annotated.pm      2002-08-16 17:55:31.000000000 -0400
+++ ./blib/lib/Chart/Plot/Annotated.pm  2005-04-02 10:30:00.000000000 
+-0500
@@ -11,7 +11,7 @@
 use base 'Chart::Plot';
 use Class::MethodMaker
   # the extra data we'll put into the Chart::Plot object
-  object_list => [ Chart::Plot::Annotated::_DataPt => '_AnnoData' ],
+  object_list => [ 'Chart::Plot::Annotated::_DataPt' => '_AnnoData' ]
+,
 
   # formatting internals
   get_set => [ qw [ _anno_xOffset _anno_yOffset _anno_font _anno_colo
+r ] ],
@@ -20,7 +20,7 @@
   get_set => [ '_problem' ];
 ##################################################################
 # define an auxiliary class:
-use Class::Struct Chart::Plot::Annotated::_DataPt =>
+use Class::Struct 'Chart::Plot::Annotated::_DataPt' =>
   [ X => '$', Y => '$', anno => '$' ];
 ##################################################################
 # new public method:
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