[fw-auth] Method "hasIdentity" does not exist and was not trapped in __call()

i am using a custom Zend_Auth_Adapter i implemented. code is here. when i do a Zend_Auth::authenticate($adapter);, i get "Method "hasIdentity" does not exist and was not trapped in __call()". i noticed that the problem comes from the class Zend_Auth. abt line 123

if ($this->hasIdentity()) { 	$this->clearIdentity(); }

but the funny thing is just below that function, is public function hasIdentity() so the function exists definately??

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