$this->messenger()->addError($this->t('You must install the <a href=":xmlrpc">contributed XML-RPC module</a> in order to use FillPDF Service as your PDF-filling method.',[
$this->messenger()->addError($this->t('You must install the <a href="@xmlrpc">contributed XML-RPC module</a> in order to use FillPDF Service as your PDF-filling method.',[