error in synchronizing multiple USRP

[OsamaAhmed]

Hi,

I am trying to build receive using multiple synchronized USRP 2930. I use OctoClock CDA-2990 to share 10 MHz and PPs outputs for the PPs and Ref in USRP terminals. I set the reference frequency to Ref in and the time base clock source to the PPS in.
When I run the VI, the following error occurs:
-1074118617 niUSRP set time error, can not use the PPs in port while GPSDC attached 

can anyone please suggest me a way to solve this error !?

 
Thanks