Information about handling qcSTR

I used this command
`qcSTR --vcf JPZ0127.vcf.gz --out JPZ --quality per-locus --vcftype eh` and get this result

> Requested a quality plot, but the input vcf doesn't have quality scores.
As I see the my vcf file generated by expansion hunter file there is . for QUAL column. how to solve this issue. any suggestions