[Flow] cannot use Zend Gdata

[Mira]

hey!

I added zend gdata to my packages and want to use this library but every 
time this error returns
PHP Fatal error:  Class 'Zend\Zend_Gdata' not found in 
/var/www/flow3/test/Data/Temporary/Development/Cache/Code/Flow_Object_Classes/My_Test_Controller_StandardController.php 
on line 47

if I went to directory 
/var/www/flow3/test/Data/Temporary/Development/Cache/Code/Flow_Object_Classes/ 
there is no cached object for "zend" or "gdata".

What is happened here? I use Flow 2.1 and installed gdata with composer.

best wishes!
mira