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Fatal Eror when changing a theme

  • When I change my theme – or try to change rather to say – I get this message: Fatal error: Cannot redeclare __popular_posts() (previously declared in D:\xampp\htdocs\wordpress\wp-content\themes\Diadema\functions.php:545) in D:\xampp\htdocs\wordpress\wp-content\themes\Diadema\functions.php on line 786
    After that everything freaks out – I cann’t continue working with WP at all. Even when I try to call wp-admin I get the same message.
    Please advice.

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  • Is the theme you are activating a child theme of the one that the site was already using?

    No, it is absolutly another theme – as far as I can say. The situation is so: I have dowloaded a couple of themes from different sources and extracted them to “Themes” folder. I see them all from Admin Panel. Then when I try to activate one of them then I run into this problem. Yesterday I have found out that by some reasons the code in the file “functions.php” is duplicated. I deleted a part of the code and then everything was fine – I could work with the themes. But next time with a new theme I got the same problem. I can of course delete a part of the code every time, but I just want to understand why is it happening.

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