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

Fix the problematic entry.

Error: Unrecognized escape \M passed through in regex; marked by <-- HERE in m/(?:\bRCS\b)|(?:\bCVS\b)|(?:^Makefile$)|(?:~$)|(?:^#)|(?:\.old$)|(?:^blib/)|(?:^pm_to_blib)|(?:^MakeMaker-\d)|(?:\.gz$)|(?:\.cvsignore)|(?:^tools/)|(?:\.svn/)|(?:^[^/]+\.yaml$)|(?:^[^/]+\.pl$)|(?:^\.shipit$)|(?:^\.git)|(?:^\inc)|(?:^\M <-- HERE ETA.yml)|(?:.prove)/ at lib/ExtUtils/Manifest.pm line 440.

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.

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: AnyEvent::Riak

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