Errors after upgrade to php 8

after upgrade to php 8.0:

WarningDOMDocument::loadHTML(): htmlParseEntityRef: expecting ‘;’ in Entity, line: 1-wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:142DOMDocument->loadHTML()wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:142DOMUtilForWebP\PictureTags::getAttributes()wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:201DOMUtilForWebP\PictureTags->replaceCallback()wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:201preg_replace_callback()wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:319DOMUtilForWebP\PictureTags->replaceHtml()wp-content/plugins/webp-express/vendor/rosell-dk/dom-util-for-webp/src/PictureTags.php:331DOMUtilForWebP\PictureTags::replace()wp-content/plugins/webp-express/lib/classes/AlterHtmlInit.php:57WebPExpress\AlterHtmlInit::alterHtml()wp-content/plugins/webp-express/lib/classes/AlterHtmlInit.php:57ob_end_flush()wp-includes/functions.php:5309wp_ob_end_flush_all()wp-includes/class-wp-hook.php:308do_action(‘shutdown’)wp-includes/load.php:1144shutdown_action_hook()wp-includes/load.php:1144

how to resolve?