hello,
I’ve found another solution.
I wanted to stay with Back My Book theme, so, I’ve checked what had happened.
In file “../wp-content/themes/back-my-book/admin/custom-header.php” there’s a declaration of a class Custom_Image_Header. It overlaps class that already exists in WordPress Engine – that’s the reason of fatal error.
So, I’ve replaced name of this class to Custom_Image_Header_BMB (and other occurences – 3 occurrences all together in custom-header.php file), then I’ve renamed call to this class in “../wp-content/themes/back-my-book/functions.php” file.
Line number 98:
original:
————-
$GLOBALS['custom_image_header'] =& new Custom_Image_Header($admin_header_callback, $admin_image_div_callback);
changed to:
————-
$GLOBALS['custom_image_header'] =& new Custom_Image_Header_BMB($admin_header_callback, $admin_image_div_callback);
It worked for me. You can check it at https://henrykbaranowski.pl/
I’m not a programmer, only ‘home-made screwdriver’ ;-), so, if someone can check if that’s all – I’d be very glad for feedback.
Cheers,
asceta