If all you did was try again, nothing has changed. My Pull Request has not been merged yet, no new releases have been made. If you want to run this now make the same edit I did. https://github.com/ranguard/svg-tt-graph/pull/31/files, note line 582. Perhaps a simple way to do this is to run look SVG::TT::Graph within a cpan session, this will download the latest release and drop you into a shell. Edit lib/SVG/TT/Graph/TimeSeries.pm as per the link above then run cpanm ..