ERROR 5xxx on GSC

How could I solve this :
“Fatal error: Uncaught Error: Object of class WP_Error could not be converted to string in /home/lumoebfrcv/www/wp-content/themes/illdy/inc/components/entry-meta/class-illdy-entry-meta-output.php:138Stack trace: #0 /home/lumoebfrcv/www/wp-includes/class-wp-hook.php(303): Illdy_Entry_Meta_Output->single_content_tags(’’) #1 /home/lumoebfrcv/www/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(’’, Array) #2 /home/lumoebfrcv/www/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #3 /home/lumoebfrcv/www/wp-content/themes/illdy/template-parts/content-single.php(30): do_action(‘illdy_single_af…’) #4 /home/lumoebfrcv/www/wp-includes/template.php(772): require(’/home/lumoebfrc…’) #5 /home/lumoebfrcv/www/wp-includes/template.php(716): load_template(’/home/lumoebfrc…’, false, Array) #6 /home/lumoebfrcv/www/wp-includes/general-template.php(204): locate_template(Array, true, false, Array) #7 /home/lumoebfrcv/www/wp-content/themes/illdy-child/single.php(28): get_template_part(‘template-parts/…’, ‘single’) #8 /home in /home/lumoebfrcv/www/wp-content/themes/illdy/inc/components/entry-meta/class-illdy-entry-meta-output.php on line 138”

Hi there

Sorry about it, what is the version of PHP and Wordpress?