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Can’t find the cause of this error

I am working through a Drupal 8 module building exercise from YouTube and I am not able to figure out what is causing an error. The relevant page loads and displays the form but I get the following error message:

Notice: Trying to get property of non-object in DrupalrsvplistFormRSVPForm->buildForm() (line 29 of modules/custom/rsvplist/src/Form/RSVPForm.php).

DrupalrsvplistFormRSVPForm->buildForm(Array, Object) call_user_func_array(Array, Array) (Line: 518) DrupalCoreFormFormBuilder->retrieveForm(‘rsvplist_email_form’, Object) (Line: 275) DrupalCoreFormFormBuilder->buildForm(‘rsvplist_email_form’, Object) (Line: 93) DrupalCoreControllerFormController->getContentResult(Object, Object) call_user_func_array(Array, Array) (Line: 123) DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->DrupalCoreEventSubscriber{closure}() (Line: 582) DrupalCoreRenderRenderer->executeInRenderContext(Object, Object) (Line: 124) DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97) DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->DrupalCoreEventSubscriber{closure}() (Line: 151) SymfonyComponentHttpKernelHttpKernel->handleRaw(Object, 1) (Line: 68) SymfonyComponentHttpKernelHttpKernel->handle(Object, 1, 1) (Line: 57) DrupalCoreStackMiddlewareSession->handle(Object, 1, 1) (Line: 47) DrupalCoreStackMiddlewareKernelPreHandle->handle(Object, 1, 1) (Line: 99) Drupalpage_cacheStackMiddlewarePageCache->pass(Object, 1, 1) (Line: 78) Drupalpage_cacheStackMiddlewarePageCache->handle(Object, 1, 1) (Line: 47) DrupalCoreStackMiddlewareReverseProxyMiddleware->handle(Object, 1, 1) (Line: 38) DrupalwebprofilerStackMiddlewareWebprofilerMiddleware->handle(Object, 1, 1) (Line: 52) DrupalCoreStackMiddlewareNegotiationMiddleware->handle(Object, 1, 1) (Line: 23) StackStackedHttpKernel->handle(Object, 1, 1) (Line: 693) DrupalCoreDrupalKernel->handle(Object) (Line: 19)

The code for the form is here:

<?php  /**   *@file   *Contains DrupalrsvplistFormRSVPForm   */ namespace DrupalrsvplistForm;  use DrupalCoreDatabaseDatabase; use DrupalCoreFormFormBase; use DrupalCoreFormFormStateInterface;  /**  *Provides an RSVP email form  */  class RSVPForm extends FormBase {   /**    * (@inheritdoc)    */   public function getFormId() {       return 'rsvplist_email_form';   }    /**    * (@inheritdoc)    */   public function buildForm(array $form, FormStateInterface $form_state) {       $node = Drupal::routeMatch()->getParameter('node');       $nid = $node->nid->value;       $form['email'] = array(           '#title' => t('email address'),           '#type' => 'textfield',           '#size' => 25,           '#description' => t("We will send updates to the email address you provide"),           '#required' => TRUE,       );       $form['submit'] = array(           '#type' => 'submit',           '#value' => t('RSVP'),                );       $form['nid'] = array(           '#type' => 'hidden',           '#value' => $nid,       );       return $form;   }   public function submitForm(array &$form, FormStateInterface $form_state) {       drupal_set_message(t('The form is working'));   } }

The Drupal version is 8.6.15. PHP Version is 7.0.15 Can anyone spot an error I am missing?

This article was republished from its original source.
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