Unable to connect to drone in Ableton Live

Hi,

I'm new in Synfire and just try to connect Synfire to Ableton Live with Drone. All work welll until I try to relocate my sound from Synfire to Live. When I click on my rack I have this error mesage : 

Cognitone Audio Engine (64 bit)

No Plug-ins Found

Please check your search paths for plug-ins and scan again.

I don't understand what I have to do... Please help...