Function croak() takes first parameter printf-like format. Arbitrary string from the variable $@ can cause perl crash when contains one or more '%'.
To install Devel::PPPort, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Devel::PPPort
CPAN shell
perl -MCPAN -e shell install Devel::PPPort
For more information on module installation, please visit the detailed CPAN module installation guide.