Error message in Episode View

When posting a new episode I get the following errors:

Warning : Undefined array key “post_type” in /****/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/podcast_post_meta_box.php on line 221

Warning : Cannot modify header information - headers already sent by (output started at /****/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/podcast_post_meta_box.php:221) in /homepages/45/d346472154/htdocs/advi/wp-admin/admin-header.php on line 9

Also people tell me that there is problem with the Feed.

Seems to be solved with PHP 7.4 My hosting was set to PHP 8.1

Same here. But my hoster will support PHP 7.4 only if I pay extra support.