当我将此插件安装到我的一个使用Themify Builder的站点时，它显示以下错误。

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wp_gallery_custom_links’ not found or invalid function name in /home/content/xxxxx/wp-includes/class-wp-hook.php on line 298

您或任何人以前是否遇到过此错误？有什么快速的解决方案吗？

此外，我检查了Themify，发现他们在兼容文件中添加了插件代码，如下所示。

    // WP Gallery Custom Links
if( $this->is_plugin_active( \'wp-gallery-custom-links/wp-gallery-custom-links.php\' ) ) {
add_filter( \'themify_builder_image_link_before\', \'wp_gallery_custom_links\', 10, 3 );
}

function wp_gallery_custom_links( $link_before, $image, $settings ) {
        $attachment_meta = get_post_meta( $image->ID, \'_gallery_link_url\', true );
        if( $attachment_meta ) {
            $link_before = preg_replace( \'/href="(.*)"/\', \'href="\' . $attachment_meta . \'"\', $link_before );
        }
        $attachment_meta = get_post_meta( $image->ID, \'_gallery_link_target\', true );
        if( $attachment_meta ) {
            $link_before = str_replace( \'>\', \' target="\' . $attachment_meta . \'">\', $link_before );
        }

        return $link_before;
    }

请对此进行调查，并尽快让我知道解决方案。

谢谢

$link_before = \'\' != $link ? sprintf( \'\', esc_attr( $image->post_title ), esc_url( $link ) ) : \'\';
$link_before = apply_filters( \'themify_builder_image_link_before\', $link_before, $image, $settings );

$custom_link = get_post_meta( $image->ID, \'_gallery_link_url\', true );
$custom_link_target = get_post_meta( $image->ID, \'_gallery_link_target\', true );
if($custom_link){
   $link = $custom_link;
}
$link_before = \'\' != $link ? sprintf( \'\', esc_attr( $image->post_title ), esc_url( $link ), $custom_link_target ) : \'\';
//$link_before = apply_filters( \'themify_builder_image_link_before\', $link_before, $image, $settings );