Image Cache

Hi,
my problem is
Podlove Image Cache: Unable to resize. Die Abmessungen des größenveränderten Bildes konnten nicht berechnet werden.

Server Nginx Log:
2021/03/15 15:57:08 [error] 1860#1860: *1449 FastCGI sent in stderr: “PHP message: PHP Warning: getimagesize(/var/www/wodcast/wp-content/cache/podlove/0c/ab43b2378793db02367580c3590ca8/wodcast-leeraufnahme_200x.png): Failed to open stream: No such file or directory in /var/www/wodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/images.php on line 123PHP message: PHP Warning: Trying to access array offset on value of type bool in /var/www/wodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/images.php on line 124PHP message: PHP Warning: filesize(): stat failed for /var/www/wodcast/wp-content/cache/podlove/0c/ab43b2378793db02367580c3590ca8/wodcast-leeraufnahme_200x.png in /var/www/wodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/images.php on line 139PHP message: PHP Warning: filemtime(): stat failed for /var/www/wodcast/wp-content/cache/podlove/0c/ab43b2378793db02367580c3590ca8/wodcast-leeraufnahme_200x.png in /var/www/wodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/images.php on line 143PHP message: PHP Warning: readfile(/var/www/wodcast/wp-content/cache/podlove/0c/ab43b2378793db02367580c3590ca8/wodcast-leeraufnahme_200x.png): Failed to open stream: No such file or directory in /var/www/wodcast/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/images.php on line 157” while reading response header from upstream, client: 185.13.29.176, server: wodcast.de, request: “GET /podlove/image/68747470733a2f2f776f64636173742e64652f77702d636f6e74656e742f75706c6f6164732f323032312f30332f3435684a716951565f343030783430302e706e67/500/0/0/wodcast-leeraufnahme HTTP/2.0”, upstream: “fastcgi://unix:/run/php/php8.0-fpm.sock:”, host: “wodcast.de”, referrer: “https://wodcast.de/
2021/03/15 16:02:25 [error] 1860#1860: *1580 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function submit_button() in /var/www/wodcast/wp-admin/includes/file.php:2304

Anyone who knows what the problem could be?

Thanks!