无法在R中安装Swirl

Question

尝试安装漩涡式但失败，并且R控制台中出现以下消息：

package ‘sys’ successfully unpacked and MD5 sums checked
package ‘assertthat’ successfully unpacked and MD5 sums checked
package ‘askpass’ successfully unpacked and MD5 sums checked
package ‘glue’ successfully unpacked and MD5 sums checked
package ‘magrittr’ successfully unpacked and MD5 sums checked
Warning in install.packages :
  error 1 in extracting from zip file
Warning in install.packages :
  cannot open compressed file 'stringi/DESCRIPTION', probable reason 'No such file or directory'
Error in install.packages : cannot open the connection