I have saved this new module in the Perl directory of my Library

That may well be insufficient. Most modules need to be properly installed. The README for Chart::Gnuplot explains the steps you will need to take. Did you follow those?

See also A Guide to Installing Modules for an overview of installing modules.

In reply to Re: Locating Chart::Gnuplot by hippo
in thread Locating Chart::Gnuplot by SevenDimensions

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