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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 "README" is missing from this distribution. The README provides some basic information to users prior to downloading and unpacking the distribution.

Add a README to the distribution. It should contain a quick description of your module and how to install it.

The file "MANIFEST" is missing from this distribution. The MANIFEST lists all files included in the distribution.

Add a MANIFEST to the distribution. Your buildtool should be able to autogenerate it (eg "make manifest" or "./Build manifest")

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.

Makefile.PL and/or Build.PL are missing. This makes installing this distribution hard for humans and impossible for automated tools like CPAN/CPANPLUS/cpanminus.

Add a Makefile.PL (for ExtUtils::MakeMaker/Module::Install) or a Build.PL (for Module::Build and its friends), or use a distribution builder such as Dist::Zilla, Dist::Milla, Minilla.

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.

The distribution filename (eg. Foo-Bar-1.42.tar.gz) does not include a version number (or something that looks like a reasonable version number to CPAN::DistnameInfo)

Add a version number to the packed distribution. Or use a buildtool ('make dist' or 'Build dist')

The version number isn't a number. It probably contains letter besides a leading 'v', which it shouldn't

Remove all letters from the version number. If you want to mark a release as a developer release, use the scheme 'Module-1.00_01'

This distribution does not have a license defined in the documentation or in a file called LICENSE

Add a section called "LICENSE" to the documentation, or add a file named LICENSE to the distribution.

Does not have license information in any of its source files

Add =head1 LICENSE and the text of the license to the main module in your code.

MANIFEST does not match the contents of this distribution.

Run a proper command ("make manifest" or "./Build manifest", maybe with a force option), or use a distribution builder to generate the MANIFEST. Or update MANIFEST manually.

This distribution does not 'use strict;' (or its equivalents) in all of its modules. Note that this is not about the actual strictness of the modules. It's bad if nobody can tell whether the modules are strictly written or not, without reading the source code of your favorite clever module that actually enforces strictness. In other words, it's bad if someone feels the need to add 'use strict' to the modules.

Add 'use strict' to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules are strictly written.

This distribution has .pm files with inconsistent versions.

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

None of the package versions in this distribution matches the distribution version.

Fix the version(s).

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.

This distribution contains either a file called 'test.pl' (the old test file) or is missing a directory called 't'. This indicates that it uses the old test mechanism or it has no test-suite.

Add tests or move tests.pl to the t/ directory!

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.

Does not have license information in any of its source files, or the information is not recognized by Software::License

Add =head1 LICENSE and/or the proper text of the well-known license to the main module in your code.

This distribution does not 'use warnings;' 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 modules 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 the modules.

Add 'use warnings' 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 does this automatically for you.

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.

It is easy to repackage this module by Debian.

Fix each one of the metrics this depends on.

It is easy to repackage this module by Fedora.

Fix each one of the metrics this depends on.

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.