prefetch command in sra-toolkit/2.8.2-1 produces the error "lock exists" when downloading SRA files from NCBI

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Hi,
I am trying to download SRA files from NCBI from sra-toolkit. First I made a list of the names of files I needed to download in SraAccList.txt, and then I am running command prefetch.
My command is as follows
$ module load nixpkgs/16.09 sra-toolkit/2.8.2-1
$ prefetch –max-size 72000000000  –option-file SraAccList.txt
I get the following errors
2019-01-08T14:11:47 prefetch.2.8.2: 1) Downloading ‘SRR893003’…
2019-01-08T14:11:47 prefetch.2.8.2 warn: lock exists while copying file – Lock file /home/sjossey/ncbi/public/sra/SRR893003.sra.lock exists: download canceled
2019-01-08T14:11:47 prefetch.2.8.2: 1) failed to download SRR893003
2019-01-08T14:11:47 prefetch.2.8.2: 2) Downloading ‘SRR896642’…
2019-01-08T14:11:47 prefetch.2.8.2 warn: lock exists while copying file – Lock file /home/sjossey/ncbi/public/sra/SRR896642.sra.lock exists: download canceled
2019-01-08T14:11:47 prefetch.2.8.2: 2) failed to download SRR896642

Hope someone can provide some insight as to how I can resolve it and download.
Thanks,
Sushma