i rasterized an image in illustrator (cs2, mac osx 10.3).

i selected the image and then tried using stroke raster.js

/Applications/Adobe Illustrator CS2/Plug-ins.localized/Scriptographer/scripts/rasters/raster.js:11,0: 
TypeError: Cannot find function getSelectedArt. 
(/Applications/Adobe Illustrator CS2/Plug-ins.localized/Scriptographer/scripts/rasters/raster.js#11)

what am i doing wrong?

should the image be a certain file type?
it was in grayscale and i opened it from a .psd file.

thanks