Off topic:Problem calling somatic variations using Strelka-2 (configureStrelkaSomaticWorkflow.py)

Question

[Raheleh]

Hi I am trying to call somatic variations using Strelka2, but I get this error:

configureStrelkaSomaticWorkflow.py Can't find expected fasta index file: index_bwa/hg38.fa.fai

I'm doing the exact command given from the website:

strelka-2.9.2.centos6_x86_64/bin/configureStrelkaSomaticWorkflow.py --normalBam BC.bam --tumorBam XL.bam --ref index_bwa/hg38.fa --runDir demo_somatic

I got this command from the recommended workflow of the website (Link).

Any help? Thanks!