Wizard component: problem with proceding to next step...

My steps are as follows:

$this->Wizard->steps = array('account','shipping','step2');

On clicking the "Next" button, it throws following error:

Warning (512): Step validation: shipping is not a valid step. [APP
\controllers\components\wizard.php, line 151]

Form tag in account.ctp is as follows:

<?php echo $form->create('null',array('id'=>'accountStep','url'=>'/
wizards/wizard/shipping'));?>

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