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.

Error: Params::Callback, Params::CallbackRequest, Params::CallbackRequest::Exceptions

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