Error: Undefined class constant ‘UPPER’ in Symfony

What is causing this error and how I can fix it?

Error: Undefined class constant ‘UPPER’ in SymfonyComponentHttpFoundationResponseHeaderBag->set() (line 115 of /var/www/html/simplesaml/vendor/symfony/http-foundation/ResponseHeaderBag.php).

It happens when I enable the SimpleSAMLphp module.

  • Drupal core 8.9.6
  • SimpleSAMLphp Authentication 8.x-3.2

Source: Symfony Questions

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