Invalid argument supplied...

ah also those two lines in the end I have:

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at C:\xampp\htdocs\wordpress\wp-content\plugins\meta-box\inc\meta-box.php:369) in C:\xampp\htdocs\wordpress\wp-content\plugins\unyson\framework\includes\hooks.php on line 256
Warning: array_unique() expects parameter 1 to be array, null given in C:\xampp\htdocs\wordpress\wp-includes\post-template.php on line 772

Warning: join(): Invalid arguments passed in C:\xampp\htdocs\wordpress\wp-includes\post-template.php on line 557
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Hi Anh 🙂

There you go:

/**
 * Displaying all custom metaboxes
 */

add_filter( 'rwmb_meta_boxes', 'lhk_register_home_meta_boxes' );

function lhk_register_home_meta_boxes( $meta_boxes ) {

$files_contact          =  glob( get_template_directory() .'/inc/contact-mod/<em>.php' );
$files_csi              =  glob( get_template_directory() .'/inc/csi-mod/</em>.php' );
$files_general          =  glob( get_template_directory() .'/inc/general-mod/<em>.php' );
$files_home             =  glob( get_template_directory() .'/inc/home-mod/</em>.php' );
$files_how              =  glob( get_template_directory() .'/inc/how-mod/<em>.php' );
$files_prod             =  glob( get_template_directory() .'/inc/product-mod/</em>.php' );
$files_post             =  glob( get_template_directory() .'/inc/post-mod/<em>.php' );
$files_testimonials     =  glob( get_template_directory() .'/inc/testimonials-mod/</em>.php' );

$all_files = [ $files_contact, $files_csi, $files_general , $files_home, $files_how , $files_prod , $files_post, $files_testimonials  ];

foreach ( $all_files as $key => $files ) {
    foreach( $files as $file ){

    $meta_boxes[] = include $file;

    }
}

return $meta_boxes;
}

Thank you 🙂

Ahn, I am just wondering... If I registered some fields e.g. email filed this way:

[
'id' => 'contact_email',
'type' => 'email',
'name' => esc_html__( 'Email:', 'lhk' ),
'desc' => esc_html__( 'Please insert your email here.', 'lhk' ),
'size' => 50,
],

where 'type' is 'email' instead of e.g. 'text' could it caused the problem?
I have a few fields registered as 'type' => 'url' .... when I checked the documentation there are no these types of fields...