How to increase stolon DB max_connections

Hi , I was trying to increase stolon database max_connections from 100 to 200. I have changed the max_connections value in postgresql.conf also but still inside db the max_connections is 100. It didn’t changed to 200.
I have also tried ALTER SYSTEM SET max_connections=200 but this command giving below error.
“ERROR: could not fsync file “”: Invalid argument”

Anyone please help how we can increase stolon max_connections from 100 to 200 .