gmnl latent class model (R) error "Error in t.default(x) : argument is not a matrix"

I got the same error message.

The issue seems to be connected to the mlogit-package.

After going back to a previous version of mlogit (1.0-2), I was able to get the code running. You can install this version with the following code:

install.packages("https://cran.r-project.org/src/contrib/Archive/mlogit/mlogit_1.0-2.tar.gz", repos=NULL,type="source")

and then try to rerun the latent class model:

data("Electricity", package = "mlogit")
Electr <- mlogit.data(Electricity, id.var = "id", choice = "choice", varying = 3:26, shape = "wide", sep = "")
Elec.lc <- gmnl(choice ~ pf + cl + loc + wk + tod + seas | 0 | 0 | 0 | 1, data = Electr, subset = 1:3000, model = "lc", panel = TRUE, Q = 2)
summary(Elec.lc)

However, this is only a temporary workaround.