Warning: require_once(indice.php): Failed to open stream: No such file or directory in /hosting/www/collatz.es/public/capitulo1.php on line 7

Fatal error: Uncaught Error: Failed opening required 'indice.php' (include_path='.:/usr/share/php') in /hosting/www/collatz.es/public/capitulo1.php:7
Stack trace:
#0 {main}
  thrown in /hosting/www/collatz.es/public/capitulo1.php on line 7