ENSEMBL database error

[kdillmcfarland]

Describe the bug

I've been working my way through your BIGslu example and I ran into an error that I wanted to let you know about. It could be a me doing something wrong but when I try to import an ensembl reference I get the following error

"Error in bmRequest(request = request, httr_config = httr_config, verbose = verbose) :
Service Unavailable (HTTP 503)."

Changing the mirror to "useast" solved the problem for me

line 245:
ensembl <- biomaRt::useEnsembl(biomart="ensembl", dataset="hsapiens_gene_ensembl", mirror = "useast")