I just updated my magento installation from 1.7 to the latest version via FTP

and now when I try to access the website or the backend I get the error

    Fatal error: Class 'Magento_Db_Adapter_Pdo_Mysql' not found in 

/home/xxxxx/public_html/includes/src/__default.php on line 29298

Any ideas what is wrong?


As per as your question, i have see that complier is enable at system.So you should disable the compile before upgrade.After upgrade you need enable compiler

Disable compiler by command prompt

php -f shell/compiler.php -- disable
php -f shell/compiler.php -- clear 

or By file remove command at stat and add comment src at file includes/config.php


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