title: Attempted to load class from namespace did you forget a "use" statement for another namespace?
body: <p>I'm using a Cassandra class in my code and this error is always showing up "Attempted to load class from namespace did you forget a "use" statement for another namespace?" here are my codes</p>
  
  <p>DefaultController</p>
  
  <pre><code>&lt;?php
  
  namespace Acme\SampleBundle\Controller;
  
  use Symfony\Bundle\FrameworkBundle\Controller\Controller;
  use Cassandra;
  
  class DefaultController extends Controller
  {
  public function indexAction()
  {
      $con = new Cassandra\Timestamp();
  
      echo $con;
  }
  }
  </code></pre>
  
  <p>Timestap.php</p>
  
  <pre><code>&lt;?php
  
  /**
  * Copyright 2015-2016 DataStax, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  namespace Cassandra;
  
  /**
  * A PHP representation of the CQL `timestamp` datatype
  */
  final class Timestamp implements Value
  {
  /**
   * Creates a new timestamp from either unix timestamp and microseconds or
   * from the current time by default.
   *
   * @param int $time Unix timestamp
   * @param int $usec Microseconds
   */
  public function __construct($time = null, $usec = null) {}
  
  /**
   * The type of this timestamp.
   *
   * @return Type
   */
  public function type() {}
  
  /**
   * Unix timestamp.
   *
   * @return int seconds
   * @see time
   */
  public function time() {}
  
  /**
   * Microtime from this timestamp
   *
   * @param bool $get_as_float Whether to get this value as float
   *
   * @return float|string Float or string representation
   * @see microtime
   */
  public function microtime($get_as_float = false) {}
  
  /**
   * Converts current timestamp to PHP DateTime.
   *
   * @return \DateTime PHP representation
   */
  public function toDateTime() {}
  
  /**
   * Returns a string representation of this timestamp.
   *
   * @return string timestamp
   */
  public function __toString() {}
  }
  </code></pre>
  
  <p>I don't know what's wrong in my code, I'm a newbie using Cassandra and symfony</p>