title: vendor/autoload.php: failed to open stream
body: <p>I worked with a project using composer.But when i run the index file,system shows the following error,</p>
  
  <pre><code>Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in D:\xampp\htdocs\instagram_php\index.php on line 5
  
  Fatal error: require_once(): Failed opening required 'vendor/autoload.php' (include_path='.;D:\xampp\php\PEAR') in D:\xampp\htdocs\instagram_php\index.php on line 5
  </code></pre>
  
  <p>I have installed composer from <a href="https://getcomposer.org/" rel="nofollow noreferrer">https://getcomposer.org/</a>.
  What am doing wrong?</p>