SAProuter: route expected

Hi

I'm having trouble connecting to a client's saprouter.

The client have a Netscaler in place and our traffic is routed via this.

The error in dev_rout on the client's side contains:

Wed Sep  5 18:43:00 2018
*** ERROR => route from C15/-1 '143.81.1.131' expected [nirout.cpp   3540]
Wed Sep  5 18:43:20 2018
*** ERROR => NiRExRouteCon: NiBufIRouteGetNext failed (rc=-2) [nirout.cpp   3977]
*** ERROR => NiRClientHandle: NiRExRouteCon for C12/-1 '143.81.1.131' failed (rc=-2) [nirout.cpp   3489] Wed Sep  5 18:43:37 2018
*** ERROR => route from C8/-1 '143.81.1.131' expected [nirout.cpp   3540]

where 143.81.1.131 is the IP of the netscaler.

Any pointers on what is wrong?
Is the problem in the saprouttab?