Redmine

*Hi All,

I’m new on this forum, and I will be appreciated if someone could help me in my issue.

Descriptions for the issue:
I tried to add or migrate the workflow plugin from here" http://www.redmine.org/plugins/custom-workflows ", and an alert appeared as the following:*

C:\Bitnami\redmine-3.0.3-0\apps\redmine\htdocs>bundle install --without development test postgresql sqlite
Fetching source index from https://rubygems.org/
Retrying source fetch due to error (2/3): Bundler::Fetcher::CertificateFailureError Could not verify the SSL certificate for https://rubygems.org/.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
Retrying source fetch due to error (3/3): Bundler::Fetcher::CertificateFailureError Could not verify the SSL certificate for https://rubygems.org/.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
Could not verify the SSL certificate for https://rubygems.org/.
There is a chance you are experiencing a man-in-the-middle attack, but most
likely your system doesn't have the CA certificates needed for verification. For
information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without
using SSL, edit your Gemfile sources and change 'https' to 'http'.

What could be the issue here?

Kindly notice that I'm using version 3.0.3

Thank you in advance
Fatin Rimawi *