Uncaught Error: Object of class WP_Error could not be converted to string
in /home/users/0/ship0054/web/321_advance/wp-content/plugins/code-snippets/php/snippet-ops.php(584) : eval()'d code on line 90

Call stack:

1. btn_relational_cat('jscss', 'jscss_cat', '事例一覧はこちら')
   wp-content/themes/twentysixteen-child/archive.php:224
2. require('/home/users/0/ship00...en-child/archive.php')
   wp-includes/template.php:812
3. load_template('/home/users/0/ship00...en-child/archive.php', false, array)
   wp-includes/template.php:745
4. locate_template(array, true, false, array)
   wp-includes/general-template.php:206
5. get_template_part('archive')
   wp-content/themes/twentysixteen-child/taxonomy.php:19
6. include('/home/users/0/ship00...n-child/taxonomy.php')
   wp-includes/template-loader.php:106
7. require_once('/home/users/0/ship00.../template-loader.php')
   wp-blog-header.php:19
8. require('/home/users/0/ship00...e/wp-blog-header.php')
   index.php:17