Support » Localhost Installs » call_user_func_array(): Argument #1 ($callback) must be a valid callback

  • moonplb



    I am new here. I am getting this error while viewing any of my WordPress page or post “

    Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, no array or string given in E:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php:308 Stack trace: #0 E:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #1 E:\xampp\htdocs\wordpress\wp-includes\plugin.php(517): WP_Hook->do_action(Array) #2 E:\xampp\htdocs\wordpress\wp-includes\general-template.php(3049): do_action(‘wp_head’) #3 E:\xampp\htdocs\wordpress\wp-includes\template-canvas.php(17): wp_head() #4 E:\xampp\htdocs\wordpress\wp-includes\template-loader.php(106): include(‘E:\\xampp\\htdocs…’) #5 E:\xampp\htdocs\wordpress\wp-blog-header.php(19): require_once(‘E:\\xampp\\htdocs…’) #6 E:\xampp\htdocs\wordpress\index.php(17): require(‘E:\\xampp\\htdocs…’) #7 {main} thrown in E:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php on line 308

    I was basically making a plugin. The plugin works fine in live server or website. But in localhost, I am getting that fatal error and am unable to view any post or page. I am unable to debug or catch the problem because I don’t know which callback function and argument I need to update? May I get solution about what callback function and argument I need to update?

    • This topic was modified 1 month ago by moonplb.

    The page I need help with: [log in to see the link]

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  • threadi


    Look in your code for a function call like



    add_filter(null, 'custom_function_name');

    Because obviously some filter hook is called without a filter name.

    For further debugging you could also test your code and comment out parts to see if the commented out part is responsible.

    Thread Starter moonplb


    Hi Threadi,

    Thanks for your guide. Let me debug regarding your guide.

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