I was getting this error while trying to create a custom form in Symfony 1.4.

Firstly, make sure that you define the widgets, the validators, the schema labels, and the name format in the form class:

class LoginForm extends BaseForm {

    public function configure() {
            'email'         => new sfWidgetFormInputText(),
            'password'      => new sfWidgetFormInputPassword(),
            'email'         => new sfValidatorEmail(),
            'password'      => new sfValidatorString(array('min_length' => 6)),
            'email'         => 'E-mail address',
            'password'      => 'Password',


Secondly, make sure that you are rendering the form using both echo $form and echo $form->renderHiddenFields();:

<?php use_stylesheets_for_form($form) ?>
<?php use_javascripts_for_form($form) ?>

<form action="<?php echo url_for('user/login'); ?>" method="post" <?php $form->isMultipart() and print 'enctype="multipart/form-data" ' ?>>
<?php echo $form->renderHiddenFields()?>
<input type="submit" value="Login" />
<?php echo $form ?>

Finally, ensure that you have the correct logic in your actions.class.php:

public function executeLogin(sfWebRequest $request) {
    $this->form = new LoginForm();
    // it's important to check for POST method, rather than the existence of parameters, e.g. $request->hasParameter()
    if ($request->isMethod(sfRequest::POST)) {
        $this->processLoginForm($request, $this->form);
    } else {
        // don't do anything

  protected function processLoginForm(sfWebRequest $request, sfForm $form)
    $form->bind($request->getParameter($form->getName()), $request->getFiles($form->getName()));
    if ($form->isValid())
      // do some logic here