Jags error when using jags.parallel(): "all connections are in use"

Question

I am using the R2Jags package and I want to use the jags.parallel function to speed up computations. I use the following code:

jags.data <- list("y", "N")
    n.chains = 3
    n.burnin=5000
    n.thin=1
    n.iter=10000
    mod_ss = do.call(jags.parallel, list(jags.data, jags.params, model.file=model.loc, n.chains, n.burnin, n.thin, n.iter))

The error that I get is Error in file(con, "w") : all connections are in use.

Does anyone know what could cause this? Thanks in advance.