FOP disapear after clean Installlation

I installed succesfull the last FreePBX distro 1.811.210.57
But the FOP does not work
In the start web screen when press Operation Panel Button opened a new window with message:
The requested URL /isymphony was not found on this server

I tried to find in the Advanced Settings Module the Disable FOP option but there does not exist
Where is it??