Trainz

I have the following error:

ERROR: RENDERER INITIALIZATION HAS FAILED USE THE DEVELOPER MENU TO SHOW THE LOGS FOR FURTHER DETAILS.

My Computer is:

Windows 7 64 bits
CPU: AMD 8305 (8CPUs)
RAM: 16GB
HD: SOlid 350 GB
Graphics: Ati Radeon HD 4870
Directx11