Function error

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  • #139028

    I have an error on my website with these debug data

    Can you help me solve it?

    PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function “nirvana_pp_slider” not found or invalid function name in /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/class-wp-hook.php:308
    Stack trace:
    #0 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
    #1 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/plugin.php(517): WP_Hook->do_action()
    #2 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/general-template.php(3065): do_action()
    #3 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-content/plugins/cf7-live-preview/preview-template.php(24): wp_footer()
    #4 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/template-loader.php(106): include(‘…’)
    #5 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-blog-header.php(19): require_once(‘…’)
    #6 /mnt/web415/d1/16/54377116/htdocs/WordPress_01/index.php(17): require(‘…’)
    #7 {main}
    thrown in /mnt/web415/d1/16/54377116/htdocs/WordPress_01/wp-includes/class-wp-hook.php on line 308

    Website: www.dragonetred.com

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