I changed the fps rate in the Preview panel.
From 29.97fps to 59.94fps.
And I did a preview.
When I went back to 29.97, and did preview, appears this error, when i try make RAM Preview.
It seems that fps with number integer works normal, because I've put in 30 fps, 25, 24, 15, and all work normal, the problem appears only when put in 29.97fps or 59.94fps.