Unreal engine 4.5 does't start [DDC]

17620-cattura.png

intel core i7 4770k
8gb ram
r9 290x amd catalyst 14.9

when I start the editor I get an error and tells me to change the parameters [derivedDataBackendGraph] like in the screen i have posted.
thanks to all !!

It says it all. Try to put your engine source to a shorter path or edit [DerivedDataBackendGraph] your Engine\Config\BaseEngine.ini to set another paths for your cache

thanks i try to do it!!