Hi,

I am trying to use infercnvpy on my single-cell dataset, but when I run:
cnv.tl.infercnv(
adata,
reference_key="leiden_1.0",
reference_cat='12',
)

I get the error message: ValueError: need at least one array to concatenate.

When I run:
adata.var.loc[:, ["gene_ids", "chromosome", "start", "end"]].head()
I can see that these columns were successfully added to adata.var

When I run:
adata.obs.head()
I can see that there is a column, 'leiden_1.0' with clusters numbered '0'-'16'.

I'm not sure what this error message means or what I can do differently to fix it.

Thank you