Blank page when accessing to AM Revolution slider or some extensions in the admin panel ( Magento1 )

This issue occur when you have not applied the patches, please follow the below instruction

- If you use magento 1.9.1.x, so please apply the content of patch1.9.1.x to magento root on your server

- If you use magento 1.9.2.x, so please apply the content of patch1.9.1.x and 1.9.2.x to magento root on your server ( 1.9.1.x -> 1.9.2.x )

- If you use magento 1.9.3.x, so please apply the content of patch1.9.1.x, 1.9.2.x and 1.9.3.x to magento root on your server ( 1.9.1.x -> 1.9.2.x -> 1.9.3.x ).

Also you should disable cache and compilation while using the frontend builder.