Ah I see. Well in that case you're missing a shader stage or two. You may also have misspelled forcefield. Make sure the texture and shader don't share the same name.
textures/nintendo_land/forcefeild
{
surfaceparm nolightmap
surfaceparm nomarks
surfaceparm noimpact
surfaceparm nodraw
surfaceparm slick
{
map nintendo_land/SOMETEXTURE.tga
}
{
map $lightmap
blendfunc filter
}
}