redo the library path

README.md

@@ -24,9 +24,9 @@ https://www.drupal.org/docs/8/extending-drupal-8/installing-drupal-8-modules
 for further information.
 
 Download the https://www.npmjs.com/package/ckeditor-widgetmenu into your
-projects root `/libraries` directory. Verify that the package path is correct by
-locating the following `plugin.js` file at
-`/libraries/ckeditor_widgetmenu/plugin.js`
+projects root `/libraries` directory. Ensure that the directory is named
+`widget_menu`. Verify that the package path is correct by locating the following
+`plugin.js` file at `/libraries/widget_menu/plugin.js`
 
 
 CONFIGURATION

src/Plugin/CKEditorPlugin/CKEditorWidgetMenu.php

 <?php
 
-namespace Drupal\ck_widget_menu\Plugin\CKEditorPlugin;
+namespace Drupal\ckeditor_widget_menu\Plugin\CKEditorPlugin;
 
 use Drupal\ckeditor\CKEditorPluginBase;
 use Drupal\editor\Entity\Editor;
@@ -25,7 +25,7 @@ class CKEditorWidgetMenu extends CKEditorPluginBase {
   public function getButtons() {
     return [
       'widget_menu' => [
-        'image' => base_path() . 'libraries/ckeditor_widgetmenu/icons/widget_menu.png',
+        'image' => base_path() . 'libraries/widget_menu/icons/widget_menu.png',
         'label' => $this->t('Widget Menu'),
       ],
     ];
@@ -35,7 +35,7 @@ class CKEditorWidgetMenu extends CKEditorPluginBase {
    * {@inheritdoc}
    */
   public function getFile() {
-    return 'libraries/ckeditor_widgetmenu/plugin.js';
+    return 'libraries/widget_menu/plugin.js';
   }
 
   /**