Error on EPUB Export

Error: NoSuchKey: The specified key does not exist.

When exporting to EPUB using EPUB chapterend template on cloud68 demo

@kominoshja @alexgeorg

@alexgeorg here is the link to the log file: i will be sending you on mattermost the password to access this.

@dejvid the logs are super weird, for example I see so many cron jobs running for some reason. Could you please try to restart the app and the services and also have a look at these cron jobs which are running by the root user?

@adam the EPUB exports should work now