'Error in rChart$copy() : could not find function "new" 'when using Rscript

[52teth]

Hi,
Recently I try to use hPlot fuction for pie plot. When I run in the R platform, it plots successfully. But when I write my script in an R scirpt "pie.R" and run by Rscript pie.R, the following error appears：
Error in rChart$copy() : could not find function "new"
Calls: hPlot ->
Execution halted

The following is the pie.data used to plot:
type value label
1 O 133 O:20.7%
2 A 78 A:12.1%
3 B 69 B:10.7%
4 C 7 C:1.1%
5 D 73 D:11.3%
6 Other 284 Other:44.1%

Here is my script from "pie.R" :
pie1<-hPlot(x = "label", y = "value", data = pie.data, type = "pie",title=opt$title)
pie1$colors(rep(col,length=nrow(pie.data)))
pie1$legend(align = 'right', verticalAlign = 'top', layout = 'vertical',showInLegend='true')
out=paste(opt$outfile,".html",sep = "")
pie1$save(out,standalone=TRUE)

How can I deal with this problem? Can the rCharts be used in Rscript?
Thanks a lot for any suggestion!

[ghost]

Well, I read somewhere that --default-packages=methods,utils needs to be passed to Rscript to work around this: stan-dev/rstan#190

Also, it seems, Rscript being missing the load of the methods package. This can also be fixed by calling library('methods') at the beginning of your script: dhimmel/elevcan#1.