{"error":"no_method","error_message":"Could not find a route with 2 elements"}

$config = Drupal::config('example.settings');
  $instance_url = $config->get('api_url');
  $username = $config->get('username');
  $password = $config->get('password');

  $auth_url = $instance_url . "/oauth2/token";

  $oauth2_token_arguments = array(
    "grant_type" => "password",
    "client_id" => "example",
    "client_secret" => "",
    "username" => $username,
    "password" => $password,
    "platform" => "custom_api"
  );

  $auth_request = curl_init($auth_url);
  curl_setopt($auth_request, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
  curl_setopt($auth_request, CURLOPT_HEADER, false);
  curl_setopt($auth_request, CURLOPT_SSL_VERIFYPEER, 0);
  curl_setopt($auth_request, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($auth_request, CURLOPT_FOLLOWLOCATION, 0);
  curl_setopt($auth_request, CURLOPT_HTTPHEADER, array(
      "Content-Type: application/json"
  ));

  $json_arguments = json_encode($oauth2_token_arguments);
  curl_setopt($auth_request, CURLOPT_POSTFIELDS, $json_arguments);

  $oauth2_token_response = curl_exec($auth_request);

https://example.com/rest/v10/oauth2/token?grant_type=password&username=xxxxxx&password=xxxxxx&client_id=sugar&client-secret=&platform=base