lofreq can't parallel

(base) cl117@gho:~/nextflowWork/variphyer$  singularity exec container/lofreq.sif lofreq call-parallel --pp-threads 10 --call-indels -f refSeq/GCF_000240185.1_ASM24018v2_genomic.fna -o lofreq.vcf genome_3.bam
INFO [2020-08-17 11:26:22,746]: Using 10 threads with following basic args: lofreq call --call-indels -f refSeq/GCF_000240185.1_ASM24018v2_genomic.fna genome_3.bam

CRITICAL [2020-08-17 11:26:22,750]: lofreq exited with error code '1'. Command was 'lofreq idxstats genome_3.bam'. stderr was: '[bam_idxstats] fail to load the index.
'
Traceback (most recent call last):
  File "/miniconda/bin/lofreq2_call_pparallel.py", line 746, in <module>
    main()
  File "/miniconda/bin/lofreq2_call_pparallel.py", line 557, in main
    bam_bins = [Region._make(x) for x in bins_from_bamheader(bam)]
  File "/miniconda/bin/lofreq2_call_pparallel.py", line 269, in bins_from_bamheader
    sq_list = sq_list_from_bam(bam)
  File "/miniconda/bin/lofreq2_call_pparallel.py", line 246, in sq_list_from_bam
    raise OSError
OSError