ms simulation failed

[Thinking2018]

I use coala package to simulate coalescent data

with fixed number of markers

The code is as follows
m = 100
locus.n = 500
model <- coal_model(m, 0) +
locus_averaged(locus.n,10)+
feat_mutation(1,fixed_number = T) +
sumstat_seg_sites()

sumstats <- simulate(model,seed = 124+i)
sites <- sumstats$seg_sites
X <- sapply(sites,as.matrix)

When I package the above code into a function use `parSapply' to simulate more data matrix X,
it shows that error message

ms simulation failed

[xuelingyi]

I got a similar error. Perhaps you have solved it, but if not, adding the feature feat_pop_merge() may help.