Problem creating subscriptions on Replication Server version 15.7.1

if anyone knows what is the error? Can not use active or standby connection names for subscriptions I got this error when I'm trying to create my subscriptions. I have already created a repdef WITH PRIMARY AT pb1.customer and when I tried to run my subscription, WITH REPLICATE AT pb2.customer. It is showing the error. I have also created a logical connection pb1.customer for dump/load db. pb1 and pb2 are both ASE, ASE15.5 and ASE15.7 respectively. Please advise.