Bug in grd2kml?

I am trying to make a DEM google earth file with illumination. Below are the scripts that I used. There seems to be a conflict between illumination option and the -Q in grdimage.

gmt grd2kml dem.grd -Cgray -Ntest -I+a270

The error message is this:
grdimage [ERROR]: Option -Q: Cannot specify a transparent color for grids when intensities are also used

Hi @MattWei!

I believe that problem has already been solved. Are you using the latest version of GMT (6.6)? If not, try updating it.

I am using version 6.5. Do you how the problem was solved? Is it just discard -Q when -I is used?