problem with ss_create()

[robinsandfort]

When trying:

ss_create(fileloc = "C:/day/256/", #folder with the CVR-index ‘.csv’ files
samplerate = 48000,
window = 256,
index = "CVR",
date = "2024-08-07",
lat = 48.210033,
lon = 16.363449,
method = "IsoData",
output = "incidence_freq"))

I get: Error in t.default(Reduce(rbind, lapply(filenames, function(x) data.table::fread(x)))[, :
argument is not a matrix

Any Idea what I´m doing wrong?

Greetings,
Robin