My MrBayes analysis stopped due to timeout in HPC.

I tried add append=yes in nex file.

begin mrbayes;

mcmc nchains=16 ngen=10000000 append=yes stoprule=yes stopval=0.1;

sump;

sumt;

end;

But when I execute nex file, errors come.

Chain 16 -- -419920.472208 -- -1624.922043

Could not rename file inputfile.nex.run1.t

Error appending to previous run

Could not rename file inputfile.nex.run2.t

Error appending to previous run

How can I solve this problem?