( ! ) Fatal error: Uncaught Error: Object of class WP_Error could not be converted to string in /var/www/html/wp-content/plugins/sitepress-multilingual-cms/classes/seo/class-wpml-seo-headlangs.php on line 56
( ! ) Error: Object of class WP_Error could not be converted to string in /var/www/html/wp-content/plugins/sitepress-multilingual-cms/classes/seo/class-wpml-seo-headlangs.php on line 56
Call Stack
#	Time	Memory	Function	Location
1	0.0001	399576	{main}( )	.../index.php:0
2	0.0001	401336	require( '/var/www/html/wp-blog-header.php )	.../index.php:17
3	3.7587	49441864	require_once( '/var/www/html/wp-includes/template-loader.php )	.../wp-blog-header.php:19
4	3.7667	49650344	include( '/var/www/html/wp-content/themes/ubergrid/category.php )	.../template-loader.php:74
5	3.7667	49650344	get_header( $name = ??? )	.../category.php:1
6	3.7667	49650720	locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $require_once = ??? )	.../general-template.php:41
7	3.7667	49650800	load_template( $_template_file = '/var/www/html/wp-content/themes/ubergrid/header.php', $require_once = TRUE )	.../template.php:647
8	3.7668	49657824	require_once( '/var/www/html/wp-content/themes/ubergrid/header.php )	.../template.php:688
9	3.7694	49698560	wp_head( )	.../header.php:21
10	3.7694	49698560	do_action( $tag = 'wp_head', $arg = ??? )	.../general-template.php:2614
11	3.7694	49698936	WP_Hook->do_action( $args = [0 => ''] )	.../plugin.php:453
12	3.7694	49698936	WP_Hook->apply_filters( $value = '', $args = [0 => ''] )	.../class-wp-hook.php:310
13	3.7758	50316952	WPML_SEO_HeadLangs->head_langs( '' )	.../class-wp-hook.php:286
14	3.7973	50539696	str_replace( $search = '&', $replace = '&', $subject = class WP_Error { public $errors = ['invalid_term' => [...]]; public $error_data = [] } )	.../class-wpml-seo-headlangs.php:56