Warning: Constant WP_USE_THEMES already defined in /var/www/html/wp-content/mu-plugins/test-mu-plugin.php(61) : eval()'d code on line 185

Warning: require(/var/www/html/wp-content/mu-plugins/wp-blog-header.php): Failed to open stream: No such file or directory in /var/www/html/wp-content/mu-plugins/test-mu-plugin.php(61) : eval()'d code on line 186

Fatal error: Uncaught Error: Failed opening required '/var/www/html/wp-content/mu-plugins/wp-blog-header.php' (include_path='.:/usr/local/lib/php') in /var/www/html/wp-content/mu-plugins/test-mu-plugin.php(61) : eval()'d code:186
Stack trace:
#0 /var/www/html/wp-content/mu-plugins/test-mu-plugin.php(61): eval()
#1 /var/www/html/wp-settings.php(456): include_once('/var/www/html/w...')
#2 /var/www/html/wp-config.php(135): require_once('/var/www/html/w...')
#3 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#4 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#5 /var/www/html/index.php(15): require('/var/www/html/w...')
#6 {main}
  thrown in /var/www/html/wp-content/mu-plugins/test-mu-plugin.php(61) : eval()'d code on line 186