Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: Chart, Chart::Bars, Chart::Composite, Chart::Direction, Chart::ErrorBars, Chart::HorizontalBars, Chart::Lines, Chart::LinesPoints, Chart::Mountain, Chart::Pareto, Chart::Pie, Chart::Points, Chart::Property, Chart::Split, Chart::StackedBars