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: CPAN, CPAN::Admin, CPAN::Author, CPAN::Bundle, CPAN::CacheMgr, CPAN::Complete, CPAN::Debug, CPAN::DeferredCode, CPAN::Distribution, CPAN::Distroprefs, CPAN::Distrostatus, CPAN::Exception::RecursiveDependency, CPAN::Exception::blocked_urllist, CPAN::Exception::yaml_not_installed, CPAN::Exception::yaml_process_error, CPAN::FTP, CPAN::FTP::netrc, CPAN::FirstTime, CPAN::HTTP::Client, CPAN::HTTP::Credentials, CPAN::HandleConfig, CPAN::Index, CPAN::InfoObj, CPAN::Kwalify, CPAN::LWP::UserAgent, CPAN::Mirrors, CPAN::Module, CPAN::Nox, CPAN::Plugin::Specfile, CPAN::Prompt, CPAN::Queue, CPAN::Shell, CPAN::Tarzip, CPAN::URL, CPAN::Version

Split the distribution, or fix the version numbers to make them consistent (use the highest version number to avoid version downgrade).

Error: 0.02,0.97,1.001,1.01,1.678,1.9601,1.9602,2.27,2.29,2.34,2.38,5.5,5.50,5.5001,5.5002,5.5003,5.5005,5.5009,5.501,5.5013,5.5016,5.5317,6.0001

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.

This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.