Magento 1.7 Admin Login Fatal error: Call to a member function getBlockName() on a non-object in line 43 -

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can me?

on index.php/admin following exception thrown:

fatal error: call member function getblockname() on non-object in /home/ahorraen/public_html/app/code/core/mage/captcha/block/captcha.php on line 43

delete var/cache , var/session

this works me!


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