Ich stehe vor einem Problem voncalling to a member function create() on a non-object

Bitte hilf mir, mein Code ist: -

  <?php
     echo $form->create('Register', array('action' => 'register'));
     echo $form->input('username');
     echo $form->input('password');
     echo $form->input('cnfrmpassword', array('type' => 'password'));
     echo $form->submit();
     echo $form->end();
  ?>