RPKM fails – out of Memory

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I am running rpkm on a set of 14 samples (roughly the same size assembly and same size sam file).   But on one of the samples i get the following error:
/var/spool/slurmd/job23090490/slurm_script: line 9: 63436 Killed                  /home/xxxx//rpkm/./rpkm_runningfile -c /home/xxxx/assembly/contig.fa -a /home/xxxx/read_mapping/sample.sam -s /home/xxx/sample_rpkmstats.txt -o /home/xxxx/sample/_rpkm.csv –m
slurmstepd: error: Detected 1 oom-kill event(s) in step 23090490.batch cgroup. Some of your processes may have been killed by the cgroup out-of-memory handler.
I ran all the job with the following specs:
#!/bin/bash
#BATCH –mem=128000M
#SBATCH –nodes=2
#SBATCH –cpus-per-task=32
#SBATCH –time=0-23:59
with 1 node, 32 CPUS, and 125G

Any ideas why one would fail and the others work?

Thanks!