Reason and Ableton rewire sound issue

Hi guys sorry if this question has been asked previously. I'm having a problem rewiring Reason and Ableton. Reason shows that it is in rewire mode but there is no sound once i hit the keys. I have checked the audio preferences in Reason but it's greyed out and i cant choose a driver. Reason by itself works well and vice versa. Any help would be really appreciated. Also Reason is running in 32bit mode.

Thanks!