Problem with accessing store admin after installation Fatal error: Class 'TM_FacebookLB_Helper_Data' not found in /app/Mage.php on line 520

by Peter D.
This problem is caused by enabled compilation mode during the extension installation process. In order to fix this problem you should rename easytabs.xml to easytabs.xml.off at app/etc/modules and then you will be able to access your store admin again. After that you should go to Admin > System > Tools > Compilation and turn compilation mode off.

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