I would like to test creating a node of a specific type, translating the node and then checking if the page contains specific text. Here is the code I’m using but I’m getting an error ‘testReadTimeTranslation DrupalCoreEntityEntityStorageException: Creating default object from empty value’

<?php  namespace DrupalTestsabc_readtimeFunctional;  use DrupalTestsBrowserTestBase;  /**  * Tests Readtime String Translation.  *  */ class AbcReadTimeLiveTest extends BrowserTestBase {    /**    * A test user with administrative privileges.    *    * @var DrupaluserUserInterface    */   protected $adminUser;    // phpcs:disable   /**    * Disabled config schema checking temporarily until all errors are resolved.    */   protected $strictConfigSchema = FALSE;   // phpcs:enable    /**    * Modules to enable.    *    * @var array    */   public static $modules = ['block', 'filter', 'node', 'language', 'abc_language', 'lingotek'];    /**    * {@inheritdoc}    */   protected $defaultTheme = 'classy';    /**    * {@inheritdoc}    */   protected function setUp() :void {     parent::setUp();      $this->drupalLogin($this->rootUser);      // Create and log in an administrative user.     $this->adminUser = $this->drupalCreateUser([       'administer site configuration',       'access administration pages',     ]);   }    /**    * Tests translate block .    */   public function testReadTimeTranslation() {          // Add file to node.     $node = $this->drupalCreateNode([       'type' => 'article_research',       'title' => 'Test Readtime',       'body' => [['value' => 'Then she picked out two somebodies,<br />Sally and me', 'format' => 'basic_html']],     ]);     $node->save();      $translation_node = $node->addTranslation('es');     $translation_node->setTitle('Spanish');     $translation_node->setPublished(TRUE);     $translation_node->save();      // Get node.     $this->drupalGet('node/' . $node->id());     $this->assertSession()->pageTextContains('Hora de leer: Sobre');      // Delete the translated node.     $translation_node->delete();      // Get node.     $this->drupalGet('node/' . $node->id());     $this->assertSession()->pageTextContains('Time to Read: About');   }  }