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FAQ: What does "Warning:2015 No display screen is selected for Prepare Sequence…" mean?
#1
The error "No Display screen is selected for Prepare Sequence" will occur if the Prepare Sequence action node has its "Draw to EyeLink Host" property set to "IMAGE" or "PRIMITIVE" and no Display Screen action node in the Recording Sequence has the "Use for Host Display" property enabled.

The error "Too many display screen found with Draw to Host turned on" will occur if more than one of the Display Screen action nodes in the Recording Sequence has the "Use for Host Display" property enabled. Only one Display Screen action node should have the "Use for Host Display" property enabled.  

   

See How can I display my stimuli on the Host PC for details on transferring and / or drawing images to the Host PC Display. 

If no image or drawing is required in the experiment on the Host PC display, then set the Prepare Sequence "Draw to EyeLink Host" property to "NO".