The error happens to me too, but for some reason not to my boyfriend on his computer.
What I did to avoid the error, is turning SMAA off in the SweetFx_settings.
What you can also try is to use my preset, and see if that works since I also got errors.
For some reason I cannot use SMAA and CRT in the Sweet FX settings. I always have this turned off, or I get an error. Instead, I use FXAA.