Clean URL not working

  • Hi, Code Amp!
    I using Search&Filter free v1.2.14 on WP v5.8.3.
    Suddenly(or after I do something),
    clean URLs are not working.

    This is working.
    www.yourdomain.com/?s=searchterm&category_name=uncategorized&tag=shoes&customtaxonomy=customvalue

    This is not working. And print error in debug mode.
    www.yourdomain.com/category/uncategorized/?s=searchterm&tag=shoes&customtaxonomy=customvalue

    Here is error.

    Warning: Cannot modify header information - headers already sent by (output started at /home/where_my_theme_is/index.php:9) in /home/where_my_wp_is/wp-includes/pluggable.php on line 1340

Warning: Cannot modify header information - headers already sent by (output started at /home/where_my_theme_is/index.php:9) in /home/where_my_wp_is/wp-includes/pluggable.php on line 1343

    May I tell me how should I do?
    Best regards.

    • This topic was modified 2 years, 10 months ago by bissy.
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