Fatal error: Class 'Mage_Eav_Model_Entity_Setup' not found in /home/user/public_html/includes/src/Mage_Core_Model_Resource_Setup.php on line 234
anybody can please help me to clear this issue it was working properly but from today it suddenly shows this error
I feel like not all of your core code is there. Can you do a diff between a clean install and your servers code?
If something was working one day then it stopped working suddenly. Either there is something wrong with the database, server settings were changes, or some code was changed (whether it was you or not).
Actually just disable Compilation. Newer Magento versions doesn't require this feature as compiling on modern stacks could make your store actually slower.