[R-sig-Geo] writeRaster give error "no slot of name "file" for this object..."

[newmat]

I'm using the raster-package in R. I have problem writing an RasterStack to a
multi-band tif-file. I provide an example code below that is
self-explaining. I receive the following error on the last row, using
writeRaster:
Error in attr(x at file, "transient") <- temp[[1]] : 
  no slot of name "file" for this object of class "RasterStack"

Can it be because my rasterLayers and rasterStack are "inMemory"?

rExtent <- extent(664300,665800,7585000,7586400)
rasterTemplate <- raster(rExtent, 140, 150, crs=NA) rLayers <- list() for(i
in 1:64) { rLayers[[i]] <- raster(rasterTemplate)
values(rLayers[[i]]) <- runif(ncell(rasterTemplate), min=0, max=10) }

rStack <- stack(rLayers)

writeRaster(rStack, "test.tif", overwrite=TRUE)


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