Server R process dies when I call load()

[peterjuv]

I am using a ssh tunnel and screen to connect to the server.

ssh $USER@$IP "screen -S $USER$PORT -t remoter$PORT -d -m Rscript -e 'remoter::server(port=$PORT, showmsg=TRUE, userpng=FALSE)'"

Server R process dies when I call 'load("my.RData")' and client halts. Executing in an interactive R session on the server works without any problem.

[peterjuv]

Running remoter::batch(file="my.R") I got the following output:

Warning in zmq.msg.send(data, socket, flags = flags, serialize = serialize) :
R_zmq_send: C_socket is not available.
Warning in zmq.msg.recv(socket, flags = flags, unserialize = unserialize) :
R_zmq_send: C_socket is not available.
Error in sodium::auth_decrypt(encrypted, getkey(private), getkey(theirs)) :
is.raw(bin) is not TRUE
Calls: ... remoter_receive -> receive_secure -> -> stopifnot
Execution halted

my.R consists of a single line:
load(file="my.RData", verbose=TRUE)

I am using package:sodium to connect to the server.