Automatic task error [SOLVED] and Generating Sitemap.xml

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I'm getting a '500 internal server error' after running Automatic task. (Concrete 8.4.4)

I first tried clicking on generate sitemap. It generated a empty sitemap.xml (there are few pages).

I copied/paste the url in the browser for all the tasks (for cron) and hit enter.. then I get the following error:

({"error":false,"results":[{"error":0,"result":"Indexering uitgevoerd op: 0 pagina's, 3 gebruikers, 31 bestanden en 1 site","jDateLastRun":"19 mrt. 2019 12:22:04","jHandle":"index_search","jID":"1"},{"error":0,"result":"De <a href=\"https:\/\/xxx.nl\/sitemap.xml\" target=\"_blank\">sitemaps<\/a> zijn gegenereerd (0 page)","jDateLastRun":"19 mrt. 2019 12:22:04","jHandle":"generate_sitemap","jID":"4"},{"error":0,"result":"De taak is succesvol uitgevoerd.","jDateLastRun":"19 mrt. 2019 12:22:04","jHandle":"process_email","jID":"5"},{"error":0,"result":"3 versies verwijderd van 55 pagina's (3)","jDateLastRun":"19 mrt. 2019 12:22:08","jHandle":"remove_old_page_versions","jID":"6"},{"error":0,"result":"De taak is succesvol uitgevoerd.","jDateLastRun":"19 mrt. 2019 12:22:08","jHandle":"update_gatherings","jID":"7"},{"error":0,"result":"Alle thumbnail paden zijn verwerkt.","jDateLastRun":"19 mrt. 2019 12:22:08","jHandle":"fill_thumbnails_table","jID":"9"},{"error":0,"result":"Automatic user deactivation is disabled. Job aborted.","jDateLastRun":"19 mrt. 2019 12:22:08","jHandle":"deactivate_users","jID":"10"}]}
)


Now I can't acces the website. Any solutions?

 
studio4graphics replied on at Permalink Reply
My hosting fixed it by using imagick for Thumbnails.

Still there is a problem with generating a Sitemap.xml (0 page). There are few pages. So this is a weird problem. Tried to change permissions sitemap.xml to 777. Still no change.