rDrop won't work

[venyao]

Recently I built a Shiny application and I want to use Dropbox to storage my data and then use R to read and write data. So I found your package rDrop which is exactly what I need. However, When I tried to begin the journey I got the following error.

dropbox_credentials <- dropbox_auth("w9y7653895h4h04", "4967dahbry7672s")
Error in function (type, msg, asError = TRUE) : couldn't connect to host

I can't figure out the reason. Can you help me with this? Thanks very much!

Here is my R console sessioninfo:

sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=Chinese (Simplified)_People's Republic of China.936
[2] LC_CTYPE=Chinese (Simplified)_People's Republic of China.936
[3] LC_MONETARY=Chinese (Simplified)_People's Republic of China.936
[4] LC_NUMERIC=C
[5] LC_TIME=Chinese (Simplified)_People's Republic of China.936

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] httr_0.4 Quandl_2.3.2 lubridate_1.3.3 ggplot2_1.0.0
[5] forecast_5.6 timeDate_3011.99 quantmod_0.4-0 TTR_0.22-0
[9] xts_0.9-7 zoo_1.7-11 Defaults_1.1-1 googleVis_0.5.6
[13] reshape_0.8.5 markdown_0.7.4 rmarkdown_0.2.46 shinyIncubator_0.2.1
[17] BiocInstaller_1.10.4 shiny_0.10.1 rDrop_0.3-0 stringr_0.6.2
[21] plyr_1.8.1 ROAuth_0.92.0 digest_0.6.4 RCurl_1.95-4.3
[25] bitops_1.0-6 RJSONIO_1.3-0

loaded via a namespace (and not attached):
[1] caTools_1.17 colorspace_1.2-4 devtools_1.5 evaluate_0.5.5 fracdiff_1.4-2
[6] grid_3.1.1 gtable_0.1.2 htmltools_0.2.4 httpuv_1.3.0 lattice_0.20-29
[11] MASS_7.3-34 memoise_0.2.1 munsell_0.4.2 nnet_7.3-8 parallel_3.1.1
[16] proto_0.3-10 quadprog_1.5-5 Rcpp_0.11.2 reshape2_1.4 scales_0.2.4
[21] tools_3.1.1 tseries_0.10-32 whisker_0.3-2 xtable_1.7-3

[venyao]

BTW, I can't get access to Dropbox.com since I am in China. So I modified my "hosts" file (add some IP for www.dropbox.com) and I can use Dropbox on my computer. I can ping through the www.dropbox.com.

C:\Users\ncpgr>ping www.dropbox.com

正在 Ping www.dropbox.com [108.160.165.147] 具有 32 字节的数据:
来自 108.160.165.147 的回复: 字节=32 时间=208ms TTL=45
来自 108.160.165.147 的回复: 字节=32 时间=206ms TTL=45
来自 108.160.165.147 的回复: 字节=32 时间=210ms TTL=45
来自 108.160.165.147 的回复: 字节=32 时间=206ms TTL=45

108.160.165.147 的 Ping 统计信息:
数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
最短 = 206ms，最长 = 210ms，平均 = 207ms