Error in as.vector(x, "character") : cannot coerce type 'closure' to vector of type 'character'

[kamaulindhardt]

When I run this code in the PNV tutorial I get the error: Error in as.vector(x, "character") : cannot coerce type 'closure' to vector of type 'character'

grid1km$cool.mixed.forest <- biome1km$predictions[, 
                        which(attr(biome1km$predictions, "dimnames")[[2]] == "cool.mixed.forest")]

library(devtools)
# install_github("envirometrix/plotKML", force = TRUE)
# install_github("envirometrix/plotKML", ref = "stars")
# install.packages("plotKML")
library(terra)
library(plotKML)



plotKML(grid1km["cool.mixed.forest"], 
        file.name = "Biome00k_M_cool.mixed.forest_T9998.kml", 
        folder.name = "cool.mixed.forest",
        raster_name = "Biome00k_M_cool.mixed.forest_T9998.png",  
        colour_scale=SAGA_pal[[10]])

What can be the problem?