Fatal error: Declaration of Drupal\pdf_serialization\Encoder\PdfEncoder::encode($data, $format, array $context = []) must be compatible with Symfony\Component\Serializer\Encoder\EncoderInterface::encode(mixed $data, string $format, array $context = []): string in /home/libiub/public_html/modules/contrib/pdf_serialization/src/Encoder/PdfEncoder.php on line 66