Regarding rtkrcv.conf

[Niteesh-chowdary]

I am trying to connect VFAN GPS module to NTRIP client as it supports u-blox u-center. I want to connect the GPS module to a linux based system so I cannot use u-center application.
I want to connect the GPS to fdot NTRIP client.
I am trying to clone this repo:
cd app/rtkrcv/gcc
make
./rtkrcv
load rtkrcv.conf

and I am getting this error
ERROR MESSAGE:
invalid option value pos1-snrmask (./rtkrcv.conf:46)

** rtkrcv ver.2.4.2 console (h:help) **
rtkrcv> load rtkrcv.conf
invalid option value pos1-snrmask (rtkrcv.conf:46)
options loaded from rtkrcv.conf. restart to enable them
rtkrcv>

I set it as pos1-snrmask =35
how can I resolve this issue