Error MPI cluster of size 38 already running

General
1

Hi , I'm trying to run a parallel computation and I am facing this error while I submitted the job. What does this error mean ? How can I fix it please

library(snow)
library(snowfall) # Parallel computing
library(rlecuyer) # RNG

sfSetMaxCPUs( number = 39 )
sfInit(parallel = TRUE, cpus = 39, type = "MPI")
Library Rmpi loaded.
Error in makeMPIcluster(.sfOption$nodes, outfile = tmp, homogenous = TRUE, :
MPI cluster of size 38 already running
Error in sfInit(parallel = TRUE, cpus = 39, type = "MPI") :
Starting of snow cluster failed! Error in makeMPIcluster(.sfOption$nodes, outfile = tmp, homogenous = TRUE, :
MPI cluster of size 38 already running
Error in makeMPIcluster(.sfOption$nodes, outfile = tmp, homogenous = TRUE, :
MPI cluster of size 38 already running
Execution halted

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