RSS feeds not readable by browsers

[محروم.كوم]

I've set an RSS feed on my website (through External Data Providers in the General settings). An RSS icon becomes visible in the title bar. But when I click it, I see the error message "Can't open 'feed://forums.techlifezone.com/external.php?type=RSS2' . Error: The channel can't be loaded, because it has an unknown channel structure.' (PubSub:2)"

When I try it in Firefox, it just shows an empty page.

Did I do something wrong? I also tried XML, but that results in the error message "Can't find source file


Just to add, it's not a sudden issue. I never had RSS working on my website. __DEFINE_LIKE_SHARE__