RSS feed broken, "headers already sent"
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The RSS feed on my both sites, https://fi.tuukkavirtaperko.net and https://blogi.tuukkavirtaperko.net, is broken with the same error message: “Warning: Cannot modify header information – headers already sent by (output started at /home/tuukkav/fi/index.php:4) in /home/tuukkav/fi/wp-includes/feed-rss2.php on line 8”. I have recently valiated my theme and upgraded WordPress, but don’t know what to do to fix this.
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