Checkboxes in a simple form are not displayed

I have a simple form in a custom module that works well and is displaying my select as it should.

$form = Drupal::formBuilder()->getForm('DrupalefqFormFilterForm'); $form["container"] =  array(     'categories' => array(         '#title' => t('Select a Category'),         '#type' => 'select',         '#options' =>  array(             1 => t('Option 1'),             2 => t('Option 2'),             3 => t('Option 3'),         )     ) ); 

I would like to change Select for Checkboxes. According to this, “Checkboxes” structure is the same as per “Select”. But when I change '#type' => 'select' for '#type' => 'checkboxes' there are no checkboxes created and I got the 2 following warnings:

Notice: Undefined index: #title_display in DrupalCoreRenderElementCheckboxes::preRenderCompositeFormElement() (line 20 of core/lib/Drupal/Core/Render/Element/CompositeFormElementTrait.php). Notice: Undefined index: #id in DrupalCoreRenderElementCheckboxes::preRenderCompositeFormElement() (line 30 of core/lib/Drupal/Core/Render/Element/CompositeFormElementTrait.php). 

Adding these in an array makes the notice messages disappear but the checkboxes are still not showing.

Any idea of what’s going on ?

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