Fatal error: Uncaught Error: Interface "craft\base\Serializable" not found in /home/telefonai/public_html/test.telefonai.eu/vendor/craftcms/cms/src/fields/data/IconData.php:18 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/vendor/craftcms/cms/src/fields/data/IconData.php on line 18