Konacha:serve works but get error attempting to use the runner

[hoenth]

When I use the server

bundle exec rake konacha:serve  

and load the page, all of my mocha tests run, and are green

But when I attempt to run the same suite with the runner

bundle exec rake konacha:run

no tests run, and I get the following error report

Selenium::WebDriver::Error::JavascriptError: Error communicating with browser process: TypeError: window.top.Konacha is undefined
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/response.rb:32:in `initialize'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:81:in `new'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:81:in `create_response'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/default.rb:86:in `request'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:59:in `call'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:659:in `raw_execute'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:634:in `execute'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:365:in `execute_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/common/driver.rb:213:in `execute_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/capybara-2.11.0/lib/capybara/selenium/driver.rb:94:in `evaluate_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/capybara-2.11.0/lib/capybara/session.rb:580:in `evaluate_script'
/Users/user/projects/konacha/lib/konacha/runner.rb:24:in `run'
/Users/user/projects/konacha/lib/konacha/runner.rb:7:in `start'
/Users/user/projects/konacha/lib/konacha.rb:21:in `run'
/Users/user/projects/konacha/lib/tasks/konacha.rake:9:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-2.2.5/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
/Users/user/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `eval'
/Users/user/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `<main>'
Selenium::WebDriver::Error::JavascriptError: TypeError: window.top.Konacha is undefined
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/response.rb:32:in `initialize'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:81:in `new'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:81:in `create_response'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/default.rb:86:in `request'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/http/common.rb:59:in `call'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:659:in `raw_execute'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:634:in `execute'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/remote/w3c_bridge.rb:365:in `execute_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/selenium-webdriver-3.0.0/lib/selenium/webdriver/common/driver.rb:213:in `execute_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/capybara-2.11.0/lib/capybara/selenium/driver.rb:94:in `evaluate_script'
/Users/user/.rvm/gems/ruby-2.2.5/gems/capybara-2.11.0/lib/capybara/session.rb:580:in `evaluate_script'
/Users/user/projects/konacha/lib/konacha/runner.rb:24:in `run'
/Users/user/projects/konacha/lib/konacha/runner.rb:7:in `start'
/Users/user/projects/konacha/lib/konacha.rb:21:in `run'
/Users/user/projects/konacha/lib/tasks/konacha.rake:9:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-2.2.5/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
/Users/user/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `eval'
/Users/user/.rvm/gems/ruby-2.2.5/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => konacha:run

A couple of things that may be helpful to know. I am running these tests from within a dummy app in a rails engine that I also use to run specs for the engine. These are the stats:
Rails: 4.2.7.1
Konacha: 4.0.0
Capybara: 2.11
Selenium-webdriver: 3.0

I would be grateful for any advice. I would like to have these tests run on our CI and need the command line runner to do that.