> install_github('lchiffon/REmap')
Downloading GitHub repo lchiffon/REmap@master
from URL https://api.github.com/repos/lchiffon/REmap/zipball/master
Installing REmap
Installing 1 package: XML
试开URL’https://mirrors.tuna.tsinghua.ed ... .3/XML_3.98-1.5.zip
Content type 'application/zip' length 4291889 bytes (4.1 MB)
downloaded 4.1 MB

package ‘XML’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
        C:\Users\liutao\AppData\Local\Temp\RtmpKyrzSO\downloaded_packages
"D:/Program Files/R/R-3.3.2/bin/x64/R" --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL  \
  "C:/Users/liutao/AppData/Local/Temp/RtmpKyrzSO/devtools31b026173996/Lchiffon-REmap-faa8a59" --library="D:/Program  \
  Files/R/R-3.3.2/library" --install-tests

'D:\Program' 不是内部或外部命令，也不是可运行的程序
或批处理文件。
错误: Command failed (1)
      请问各位大神，这是什么原因？