Can't get the popup to work in a views field

I cannot get the colorbox popup to engage in a views display.

I have the title field of the node formatted using the 'Colorbox FF' formatter.

Style of Colorbox : Default
Link Colorbox to : Content

Width : 500

Height : 500

Iframe is unchecked

Anchor and Class fields are empty.

When I click on the title link in the view, it just leads to the page for the content, without the Colorbox frame.

I have tried combos of putting 'px' after the width and height values, and checking iframe. Same result.

There is a LONG error reported in Watchdog:

Notice: Undefined index: #entity_type in Drupal\colorbox_field_formatter\Plugin\Field\FieldFormatter\ColorboxFieldFormatter->settingsForm() (line 93 of /home/xxx/public_html/cc/modules/colorbox_field_formatter/src/Plugin/Field/FieldFormatter/ColorboxFieldFormatter.php) #0 /home/xxx/public_html/cc/core/includes/bootstrap.inc(548): _drupal_error_handler_real(8, 'Undefined index...', '/home/xxx/p...', 93, Array) #1 /home/xxx/public_html/cc/modules/colorbox_field_formatter/src/Plugin/Field/FieldFormatter/ColorboxFieldFormatter.php(93): _drupal_error_handler(8, 'Undefined index...', '/home/xxx/p...', 93, Array) #2 /home/xxx/public_html/cc/core/modules/views/src/Plugin/views/field/Field.php(477): Drupal\colorbox_field_formatter\Plugin\Field\FieldFormatter\ColorboxFieldFormatter->settingsForm(Array, Object(Drupal\Core\Form\FormState)) #3 /home/xxx/public_html/cc/core/modules/views_ui/src/Form/Ajax/ConfigHandler.php(165): Drupal\views\Plugin\views\field\Field->buildOptionsForm(Array, Object(Drupal\Core\Form\FormState)) #4 [internal function]: Drupal\views_ui\Form\Ajax\ConfigHandler->buildForm(Array, Object(Drupal\Core\Form\FormState)) #5 /home/xxx/public_html/cc/core/lib/Drupal/Core/Form/FormBuilder.php(514): call_user_func_array(Array, Array) #6 /home/xxx/public_html/cc/core/lib/Drupal/Core/Form/FormBuilder.php(271): Drupal\Core\Form\FormBuilder->retrieveForm('views_ui_config...', Object(Drupal\Core\Form\FormState)) #7 /home/xxx/public_html/cc/core/modules/views_ui/src/Form/Ajax/ViewsFormBase.php(212): Drupal\Core\Form\FormBuilder->buildForm('Drupal\\views_ui...', Object(Drupal\Core\Form\FormState)) #8 /home/xxx/public_html/cc/core/lib/Drupal/Core/Render/Renderer.php(574): Drupal\views_ui\Form\Ajax\ViewsFormBase->Drupal\views_ui\Form\Ajax\{closure}() #9 /home/xxx/public_html/cc/core/modules/views_ui/src/Form/Ajax/ViewsFormBase.php(214): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #10 /home/xxx/public_html/cc/core/modules/views_ui/src/Form/Ajax/ViewsFormBase.php(123): Drupal\views_ui\Form\Ajax\ViewsFormBase->ajaxFormWrapper('Drupal\\views_ui...', Object(Drupal\Core\Form\FormState)) #11 /home/xxx/public_html/cc/core/modules/views_ui/src/Form/Ajax/ConfigHandler.php(37): Drupal\views_ui\Form\Ajax\ViewsFormBase->getForm(Object(Drupal\views_ui\ViewUI), 'page_1', 'ajax') #12 [internal function]: Drupal\views_ui\Form\Ajax\ConfigHandler->getForm(Object(Drupal\views_ui\ViewUI), 'page_1', 'ajax', 'field', 'title') #13 /home/xxx/public_html/cc/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #14 /home/xxx/public_html/cc/core/lib/Drupal/Core/Render/Renderer.php(574): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #15 /home/xxx/public_html/cc/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #16 /home/xxx/public_html/cc/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #17 [internal function]: Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #18 /home/xxx/public_html/cc/vendor/symfony/http-kernel/HttpKernel.php(144): call_user_func_array(Object(Closure), Array) #19 /home/xxx/public_html/cc/vendor/symfony/http-kernel/HttpKernel.php(64): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #20 /home/xxx/public_html/cc/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /home/xxx/public_html/cc/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /home/xxx/public_html/cc/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /home/xxx/public_html/cc/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /home/xxx/public_html/cc/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /home/xxx/public_html/cc/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /home/xxx/public_html/cc/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #27 /home/xxx/public_html/cc/core/lib/Drupal/Core/DrupalKernel.php(652): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #28 /home/xxx/public_html/cc/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #29 {main}.

I cannot find a README file, the Help section has no information, and I haven't seen anything in the issue queue that addresses this.

Does anyone have any ideas of what I am doing wrong in the config? Or is this a bug?

Thanks