app creation turned into huge

Fatal error: Uncaught Error: Object of class WP_Error could not be converted to string in /home/agenciamidiacerta/www/wp-content/themes/phlox-pro/phlox-pro/templates/theme-parts/entry/single-post.php:109 Stack trace: #0 /home/agenciamidiacerta/www/wp-includes/template.php(810): require_once() #1 /home/agenciamidiacerta/www/wp-includes/template.php(745): load_template('/home/agenciami...', true, Array) #2 /home/agenciamidiacerta/www/wp-content/themes/phlox-pro/phlox-pro/templates/theme-parts/single-post.php(4): locate_template('templates/theme...', true) #3 /home/agenciamidiacerta/www/wp-includes/template.php(812): require('/home/agenciami...') #4 /home/agenciamidiacerta/www/wp-includes/template.php(745): load_template('/home/agenciami...', false, Array) #5 /home/agenciamidiacerta/www/wp-includes/general-template.php(206): locate_template(Array, true, false, Array) #6 /home/agenciamidiacerta/www/wp-content/themes/phlox-pro/phlox-pro/single.php(25): get_template_part('templates/theme...', 'post') #7 /home/agenciamidiacerta/ in /home/agenciamidiacerta/www/wp-content/themes/phlox-pro/phlox-pro/templates/theme-parts/entry/single-post.php on line 109