bootstrap-dropdown-checkbox add component not working

[angie-i4a]

I am trying to add this component https://github.com/Nelrohd/bootstrap-dropdown-checkbox to Rails Assets and I get the following error:

rake aborted!
Bundler::GemspecError: There was a Gem::Requirement::BadRequirementError while loading rails-assets-bootstrap-dropdown-checkbox.gemspec: 
Illformed requirement ["."] from
  /tmp/d20180731-15914-1fd9gbu/rails-assets-bootstrap-dropdown-checkbox.gemspec:17:in `block in <main>'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:407:in `rescue in eval_gemspec'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:395:in `eval_gemspec'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:362:in `block in load_gemspec_uncached'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:54:in `chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:54:in `block in chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:53:in `chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:357:in `load_gemspec_uncached'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:347:in `load_gemspec'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:32:in `initialize'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:14:in `new'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:14:in `install_tasks'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_tasks.rb:6:in `<top (required)>'
/tmp/d20180731-15914-1fd9gbu/Rakefile:1:in `require'
/tmp/d20180731-15914-1fd9gbu/Rakefile:1:in `<top (required)>'
Gem::Requirement::BadRequirementError: Illformed requirement ["."]
/tmp/d20180731-15914-1fd9gbu/rails-assets-bootstrap-dropdown-checkbox.gemspec:17:in `block in <main>'
/tmp/d20180731-15914-1fd9gbu/rails-assets-bootstrap-dropdown-checkbox.gemspec:6:in `new'
/tmp/d20180731-15914-1fd9gbu/rails-assets-bootstrap-dropdown-checkbox.gemspec:6:in `<main>'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:395:in `eval'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:395:in `eval_gemspec'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:362:in `block in load_gemspec_uncached'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:54:in `chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:54:in `block in chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/shared_helpers.rb:53:in `chdir'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:357:in `load_gemspec_uncached'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler.rb:347:in `load_gemspec'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:32:in `initialize'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:14:in `new'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_helper.rb:14:in `install_tasks'
/usr/local/rvm/gems/ruby-2.2.3/gems/bundler-1.12.5/lib/bundler/gem_tasks.rb:6:in `<top (required)>'
/tmp/d20180731-15914-1fd9gbu/Rakefile:1:in `require'
/tmp/d20180731-15914-1fd9gbu/Rakefile:1:in `<top (required)>'
(See full trace by running task with --trace)