how to use the delta2vcf tool

[hcph]

Hello, I noticed that the delta2vcf.pl script is available to convert the delta file to vcf format file, but when I use "perl delta2vcf.pl my.delta", the error present like "delta to vcf converter. vcf file contains variants in reference detected by query alignments. The best practice is to use delta-filter -1 before running delta2vcf, i.e. delta-filter -1 file.delta | delta2vcf > file.vcf, Usage: delta2vcf < file.delta > file.vcf". However, when I run "delta2vcf my.delta >file.vcf", also gave me an error: command delta2vcf not found. Hope you answer, thank you very much