Agfdhyk

I recetly migrate offline wordpress custom web template to online server via plugin All-in-One WP Migration. Everything works fine, except customize control panel. There is fatal erorr in debug log:

[09-Nov-2018 11:56:41 UTC] PHP Fatal error:  Uncaught Error: Class 'WP_Customize_Code_Editor_Control' not found in /wp-includes/class-wp-customize-manager.php:5317



Stack trace:

#0 wp-includes/class-wp-hook.php(286): WP_Customize_Manager->register_controls(Object(WP_Customize_Manager))

#1 wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)

#2 wp-includes/plugin.php(453): WP_Hook->do_action(Array)

#3 wp-includes/class-wp-customize-manager.php(926): do_action('customize_regis...', Object(WP_Customize_Manager))

#4 wp-includes/class-wp-hook.php(286): WP_Customize_Manager->wp_loaded('')

#5 wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)

#6 wp-includes/class-wp-customize-manager.php on line 5317

I tried some tuts like .htaccess problem, increase upload memory, deactivete all plugins or overwrite class-wp-customize-manager.php with original wp installation file.

Nothing worked.

Any idea? Many thanks in advance.

You have to define your custom fuction class within function bind to 'customize_register' action because Class WP_Customize_Control is loaded only when theme customizer is acutally used.
Sample code:

add_action( 'customize_register', 'my_customize_register' );

function my_customize_register($wp_customize) {

   //class definition must be within my_customie_register function

   class your_customize_fuction extends WP_Customize_Control { ... }

}