R source community node connection error

Error from the community R source node:

ERROR R Source 2:13 Execute failed: Failed to parse the script:

eval failed

the script is 1+1

R 3.5.2

Rserve 1.7.3

Starting R using:

library(Rserve)

Rserve(debug = TRUE, args = "–RS-conf /Rserv.conf --vanilla")

Rserv.conf content:

remote enable

auth disable

fileio enable

maxinbuf 500000

Any help would be greatly appreciated.