get_gene_annotation returns Nan

[fafa92]

Hi,

Thanks for the great package. I'm trying to follow step 1 and when I get to

scglue.data.get_gene_annotation(
    rna, gtf="gencode.vM25.chr_patch_hapl_scaff.annotation.gtf.gz",
    gtf_by="gene_name"
)

it would return Nan for all values and every gene. I looked up my RNA-seq file and it seems there are many genes in it that already have references in gtf file. I was wondering what might cause the issue. I ran with chenRNA data and everything looks fine.

P.S.: Every step before that looks fine.

I appreciate any help in advance. Thanks!