(ASK) "Video service Crashed" error message

please Help, I always got an error message “the video service possibly crashed” when I load UVIworkstation then Load Tone2 Saurus, it works well when open it in Standalone mode (open the UVI then open the Saurus), only crashed when load in Cubase, What should I do, thx so much

I’m running on PC windows 7 64 bit, intel core 2 Quad, 8 Gb memory, Cubase 6.5.5 64 bit, UVIworkstation 2.1.6 64bit, Tone2 Saurus 64 bit