When doing GO analysis in the example SpliceWiz (https://www.bioconductor.org/packages/release/bioc/vignettes/SpliceWiz/inst/doc/SW_QuickStart.html#Installation), calling viewGO(ref_path) gives following error: C:/.../Reference/fst/Ontology.fst does not exist!

ref_path <- file.path(tempdir(), "Reference")

buildRef(
    reference_path = ref_path,
    fasta = chrZ_genome(),
    gtf = chrZ_gtf(),
    ontologySpecies = "Homo sapiens"
)

ontology <- viewGO(ref_path)

# Error: sep 19 10:31:57 C:\Users\htg298\AppData\Local\Temp\RtmpUfMe5m/Reference/fst/Ontology.fst does not exist!

By looking in the fst folder I can tell that many files are present but not Ontology.fst. How can I solve this problem with a build-in function looking for a seemingly non-existing file?