I become this error while uploading my module. Warning: class_parents(): Class ProcessWire\TabButton does not exist and could not be loaded in C:\xampp\htdocs\processwire\wire\core\Functions.php on line 1059

[Abe Cube]

<?php namespace ProcessWire;
class TabExtension extends WireData implements Module {
  public static function getModuleInfo() {
    return [
      'title' => 'Foo test module',
      'summary' => 'An example of creating a module',
      'version' => 1,
      'summary' => 'Display message when pages are saved',
      'autoload' => true,
    ];
  }
  
  
  public function ready()
        {
            $this->addHookAfter('ProcessPageEdit::buildForm', $this, 'addButtons');
        }

 public function addButtons($event)
        {
            $page = $event->object->getPage();

            if ($page->template == "bewerbung") {
                $form = $event->return;
                $inputfields = new InputfieldWrapper();

                $tab = new InputfieldWrapper();
                $tab->attr('title', 'Settings');
                $tab->attr('class', 'WireTab');

                $markup = $this->modules->get('InputfieldMarkup');
                $markup->label = 'Settings';
                $markup->value = '<p>Just a placeholder for some inputfields.</p>';
                $tab->add($markup);

                $inputfields->add($tab);

                $form->add($inputfields);
            }
        }
}

[Abe Cube]

And this is the message, which is on the top of my module. Module class must implement the “ProcessWire\Module” interface.

[BitPoet]

Are you sure you uploaded the correct file? There's no mention of TabButton anywhere in your code, after all.

[horst]

@Abe Cube please use the code input to post code: 

Example: 

<?php namespace ProcessWire;
class TabExtension extends WireData implements Module {
  public static function getModuleInfo() {
    return [
      'title' => 'Foo test module',
      'summary' => 'An example of creating a module',
      'version' => 1,
      'summary' => 'Display message when pages are saved',
      'autoload' => true,
    ];
  }
  
  
  public function ready()
        {
            $this->addHookAfter('ProcessPageEdit::buildForm', $this, 'addButtons');
        }

 public function addButtons($event)
        {
            $page = $event->object->getPage();

            if ($page->template == "bewerbung") {
                $form = $event->return;
                $inputfields = new InputfieldWrapper();

                $tab = new InputfieldWrapper();
                $tab->attr('title', 'Settings');
                $tab->attr('class', 'WireTab');

                $markup = $this->modules->get('InputfieldMarkup');
                $markup->label = 'Settings';
                $markup->value = '<p>Just a placeholder for some inputfields.</p>';
                $tab->add($markup);

                $inputfields->add($tab);

                $form->add($inputfields);
            }
        }
}

 

[Abe Cube]

Thank you BitPoet for your reply. Yes I uploaded the correct file. TabExtension and TabButton are two different modules but for both of them I got the same error message. I accidently posted the wrong pic for my code, but the error messages are similar.

[adrian]

@Abe Cube - I know this is very old, but perhaps it will help someone else. I just had this same error and it turns out is was due to a mismatched class name and file name. I was testing something and my file was a typo: ProcessHiddenPageText.module.php while the class name was the correct ProcessHiddenPageTest.module.php

As soon as I fixed the filename and did a modules refresh, everything worked as expected.