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The META.yml file of this distribution could not be parsed by the version of CPAN::Meta::YAML.pm CPANTS is using.

If you don't have one, add a META.yml file. Else, upgrade your YAML generator so it produces valid YAML.

META.yml does not conform to any recognised META.yml Spec.

Take a look at the META.yml Spec at http://module-build.sourceforge.net/META-spec-v1.4.html (for version 1.4) or http://search.cpan.org/perldoc?CPAN::Meta::Spec (for version 2), and change your META.yml accordingly.

The file "META.yml" is missing from this distribution. META.yml is needed by people maintaining module collections (like CPAN), for people writing installation tools, or just people who want to know some stuff about a distribution before downloading it.

Add a META.yml to the distribution. Your buildtool should be able to autogenerate it.

The distribution hasn't got a Changelog (named something like m/^chang(es?|log)|history$/i. A Changelog helps people decide if they want to upgrade to a new version.

Add a Changelog (best named 'Changes') to the distribution. It should list at least major changes implemented in newer versions.

This distribution has at least one file with non-portable characters in its filename, which may cause problems under some environments.

Rename those files with alphanumerical characters, or maybe remove them because in many cases they are automatically generated for local installation.

The documentation for this distribution contains syntactic errors in its POD. Note that this metric tests all .pl, .pm and .pod files, even if they are in t/. See 'pod_message' in the dist error view for more info.

Remove the POD errors. You can check for POD errors automatically by including Test::Pod to your test suite.

This distribution uses a module or a dist that's not listed as a prerequisite.

List all used modules in META.yml requires

This distribution does not declare the minimum perl version in META.yml.

If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.

There is more than one .pm file in the base dir, or the .pm files are not in lib/ directory.

Move your *.pm files in a directory named 'lib'. The directory structure should look like 'lib/Your/Module.pm' for a module named 'Your::Module'.

This distribution does not have a license defined in META.yml.

Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.

This distribution does not 'use warnings;' (or its equivalents) in all of its modules. Note that this is not about that your modules actually warn when something bad happens. It's bad if nobody can tell if a module warns or not, without reading the source code of your favorite module that actually enforces warnings. In other words, it's bad if someone feels the need to add 'use warnings' to your modules.

Add 'use warnings' (or its equivalents) to all modules (this will require perl > 5.6), or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

This distribution does not have a list of provided modules defined in META.yml.

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 distribution does not have a link to a repository in META.yml.

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).

This distribution does not have a LICENSE or LICENCE file in its root directory.

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

Fits the licensing requirements of Fedora (Acceptable licenses: (perl, apache, artistic_2, gpl, lgpl, mit, mozilla)).

Replace the license or convince Fedora to accept this license as well.

It is easy to repackage this module by Fedora.

Fix each one of the metrics this depends on.