Hello! I also had this error, and it was a problem with usearch. There still was an older version of usearch on my current computer (with the same version name as the one I downloaded, but a different checksum than the one listed on the website). BPGA step 2 works perfectly with the older version from Feb 10th 2021, but when I try to run it with a current version, I experience the error listed above every time.