Error in (function () : id is invalid

[SebRW]

First experience with .loom file here. My purpose is to get the count matrix to work in Seurat later.

I'm trying to analyze loom files downloaded from there:

http://scope.aertslab.org/#/Bernard_Thienpont/Bernard_Thienpont%2FThienpont_Tumors_52k_v4_R_fixed.loom/gene

(category uncategorized)

I can generate the connection to the .loom file using:

alveolar <- connect(filename = "Thienpont_Alveolar_v4_R_fixed.loom", mode = "r+", skip.validate=T)

But when I try to see what the alveolar object looks like I have to following error:

> alveolar
Class: loom
ID: Object invalid

So that I can't access data matrix:

> alveolar[["matrix"]]
Error in (function ()  : id is invalid

What does the "ID" issue mean and how to solve it?

PS: the skip.validate=T was mandatory to be able to connect to the file