我开始用RGtk2编写一个R GUI，并且在我的代码的第三行收到错误
library(RGtk2)
window <- gtkWindow()
window["title"] <- "Testing"
错误是'externalptr'不是子集表
> sessionInfo()
R version 2.12.2 (2011-02-25)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] RGtk2_2.20.19
loaded via a namespace (and not attached):
[1] tools_2.12.2