Image registration is not working on primesense.

Hi, 
I have 2 primesense caramine 1.09. I am using openni2. I have applied `self.dev.set_image_registration_mode(openni2.c_api.OniImageRegistrationMode.ONI_IMAGE_REGISTRATION_DEPTH_TO_COLOR)`. It is working fine for one primesense and image registeration is done. But when I apply same code for second primesense, image registration is not happening for it. 
What is the issue? 

Thanks.