add band:true to properties.grid to eliminate error
add band:true to properties.grid to eliminate error

uwdata/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,vega/vega-lite