pggg.mcmc.DrawParameters returns failed scheduled cores

[lejarx]

Error in mcmc.list(lapply(draws, function(draw) draw$level_1[[i]])) :
  Arguments must be mcmc objects
In addition: Warning message:
In mclapply(1:chains, function(i) run_single_chain(i, cal.cbs, hyper_prior),  :
  scheduled cores 1, 2, 8 did not deliver results, all values of the jobs will be affected

I keep getting this failing scheduled cores when trying to run pggg.mcmc.DrawParameters

Example of my parameters is below

pggg.mcmc.DrawParameters(cal.cbs = cbs,
                                       mcmc = 10000, burnin = 10000, chains = 8, thin = 20,
                                       mc.cores = parallel::detectCores())

[mplatzer]

please provide a reproducible example