plotting raster returns error about NA

Hi List,

surely others have come across this and the solution is probably simple - I
cannot find it online anywhere. I am trying to plot a gtiff raster (produced
in grass 6.4.2, lzw compression)

image(rs) works fine but when trying to use plot I get the following error
message:
Error in .readCellsGDAL(x, uniquecells, layers) : 
  NAs are not allowed in subscripted assignments
In addition: Warning message:
In .readCells(x, cells, 1) : NAs introduced by coercion

What am I doing wrong?

thanks and cheers
Herry



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