Error in pseudobulk step

Hi,

I was having issues with my own dataset, so tried running the one given in the vignette and ran into the same problem.

In the [vignette](https://www.bioconductor.org/packages/devel/bioc/vignettes/glmGamPoi/inst/doc/glmGamPoi.html), starting in section 3.2 I ran the code from `sce <- muscData::Kang18_8vs8()` to `de_res <- test_de(fit, contrast = `stimstim` + `cellCD4 T cells:stimstim`,
pseudobulk_by = paste0(stim, "-", ind)) `

This last command resulted in the following error: Error in value[[3L]](cond) :
Object 'stim' not found. Allowed variables are:

There are no allowed variables listed after the colon. Is there a way to get it to recognize the colData columns? I am running glmGamPoi version 1.8.0.

Thanks for your help!