Fatal error: Uncaught Error: Call to a member function add_query_var() on int in /usr/www/users/wawaac/wp-includes/class-wp-taxonomy.php:503
Stack trace:
#0 /usr/www/users/wawaac/wp-includes/taxonomy.php(533): WP_Taxonomy->add_rewrite_rules()
#1 /usr/www/users/wawaac/wp-includes/taxonomy.php(63): register_taxonomy('category', 'post', Array)
#2 /usr/www/users/wawaac/wp-settings.php(513): create_initial_taxonomies()
#3 /usr/www/users/wawaac/wp-config.php(98): require_once('/usr/www/users/...')
#4 /usr/www/users/wawaac/wp-load.php(50): require_once('/usr/www/users/...')
#5 /usr/www/users/wawaac/wp-blog-header.php(12): require_once('/usr/www/users/...')
#6 /usr/www/users/wawaac/wp-xmlwaw.php(4): require('/usr/www/users/...')
#7 {main}
  thrown in /usr/www/users/wawaac/wp-includes/class-wp-taxonomy.php on line 503