diff --git a/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php b/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
index b03943c..8a40172 100644
--- a/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
+++ b/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
@@ -80,7 +80,7 @@ public function onException(GetResponseForExceptionEvent $event) {
     // Render a nice error message in case we have a file upload which exceeds
     // the configured upload limit.
     if ($exception instanceof BrokenPostRequestException && $request->query->has(FormBuilderInterface::AJAX_FORM_REQUEST)) {
-      $this->drupalSetMessage($this->t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', ['@size' => $this->formatSize($exception->getSize())]), 'error');
+      $this->drupalSetMessage($this->t('An unrecoverable error occurred. The submitted information does not match the generated form. Try reloading the page and submitting again.'), 'error');
       $response = new AjaxResponse();
       $status_messages = ['#type' => 'status_messages'];
       $response->addCommand(new ReplaceCommand(NULL, $status_messages));