First off: baku's given you a good fix
Here's the 'why' ... Perl modules that export symbols usually use the Exporter module internally. Such modules maintain lists of symbols (names of variables and subroutines) they automatically export (@EXPORT) and ones that they may export if asked to (@EXPORT_OK). (exported symbols can be accessed without fully qualifying their names).
The module you're using doesn't list either of the symbols you're asking it to export (with the qw() construct) in its list of exportable symbols, hence the error.
Philosophy can be made out of anything. Or less -- Jerry A. Fodor