error: object '.doSnowGlobals' not found?

Dear R HPC Users,

I'm trying to parallelize a code on 4 nodes(type = "SOCK"). Here is my code.


     library(itertools)
     library(foreach)
     library(doParallel)
     library(parallel)

     workers <- ip address of 4 nodes
     cl = makePSOCKcluster(workers, master="ip address of master")
     registerDoParallel(cl)

     z <- read.csv("ProcessedData.csv", header=TRUE, as.is=TRUE)
     z <- as.matrix(z)


     system.time({
       chunks <- getDoParWorkers()
       b <- foreach (these = isplitIndices(nrow(z),
                                           chunks=chunks),
                     .combine = c) %dopar% {
                       a <- rep(0, length(these))
                       for (i in 1:length(these)) {
                         a[i] <- mean(z[these[i],])
                       }
                       a
                     }
     })





I get this error..4 nodes produced errors; first error: object
'.doSnowGlobals' not found. This code runs fine if I'm using doMC i.e using
the same machine's cores. But when I try to use other computers for
parallel computing I get the above error. When I change it to
registerDoSNOW the error persists.

Does snow and DoSNOW work in a cluster? I could create nodes on the
localhost using snow but not on the cluster. Anyone out there using snow?

Thanks in advance.

With Warm Regards,
Rajendra Kumar M
Graduate Student.

School of Medical Science & Technology,
IIT Kharagpur,
West Bengal-721302.

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