class Drupal\eca_render\Plugin\Action\GetActiveTheme does not have a method "alwaysFalse"

Issue information

From user: pcate

Related to !422 (merged)

Contribution record

Fork management

Problem/Motivation

When I add the "Get active theme" action to a any models (even a empty one), when I try and save I get the ajax error:

An AJAX HTTP error occurred.
HTTP Result Code: 500
Debugging information follows.
Path: /admin/config/workflow/eca/bpmn_io/save
StatusText: error
ResponseText: The website encountered an unexpected error. Try again later.TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class Drupal\eca_render\Plugin\Action\GetActiveTheme does not have a method "alwaysFalse" in call_user_func() (line 276 of core/lib/Drupal/Core/Render/Element/MachineName.php). Drupal\Core\Render\Element\MachineName::validateMachineName(Array, Object, Array)
call_user_func_array(Array, Array) (Line: 282)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 238)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 238)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'eca_runtime_plugin_form') (Line: 118)
Drupal\Core\Form\FormValidator->validateForm('eca_runtime_plugin_form', Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('eca_runtime_plugin_form', Array, Object) (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 555)
Drupal\eca\Entity\Eca->validatePlugin(Object, Array, 'action', 'eca_get_active_theme', '') (Line: 417)
Drupal\eca\Entity\Eca->addAction('Activity_0abdr4h', 'eca_get_active_theme', '', Array, Array) (Line: 520)
Drupal\eca_modeller_bpmn\ModellerBpmnBase->readComponents(Object) (Line: 185)
Drupal\eca\Service\Modellers->saveModel(Object) (Line: 159)

After posting to ECA drupal slack:

jurgenhaas:
I haven't seen that before, but it seems unique to the GetActiveTheme action plugin which should extend the RenderActionBase, but doesn't. Please file a bug report for that.

Steps to reproduce

1. Create a new modal
2. Add the "Get active theme" action to the modal.
3. Save the model
4. In the browser console the ajax error should be displaying

Proposed resolution

Change plugin to extend the RenderActionBase

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A