I am trying to make a PLINK/SEQ project and load 3 VCF files to it.

SNPs_NA12878.vcf

SNPs_NA12891.vcf

SNPs_NA12892.vcf

These files are all in the same directory called TestVCFs

MY COMMANDS:

 pseq testproject new-project --resources hg18
 pseq /path/to/project/testproject load-vcf --vcf /path/to/TestVCFs/*.vcf

OUTPUT:

 pseq error : database (/path/to/project/testproject_out/vardb) error (5) database is locked
 plinkseq warning: database is locked (repeated 6 times)
 plinkseq warning: preparing query database is locked

Can someone please advise me on what I'm doing wrong?!