Hey Turgun,
Sorry to hear that, I unfortunately can not reproduce this issue at my end. But generally, a 500 internal error is a server issue, and if this is happening by only activating the plugin and not running it, you should drop a note to your hosting company to let them know, if this is however happing when you try to import feeds and assuming you have a lot of feeds, this probably means your server host is not powerful enougth to handle the fetching (which normally doesn’t request a lot of ressources ), so in this case, you might start shopping around for a new hosting company…. BUT, this is just speculation since I don’t know exactly why you’re getting that error, I can see your server logs and can’t reproduce the issue here, I hope this helps.
Thanks a bunch for reaching out.
Cheers,
The RSS Post Importer Nerd