Error while installing sass using gem in Windows

问题:

I install Ruby 2.3.0 using Chocolatey, then seeing this error

gem install sass
ERROR:  While executing gem ... (Errno::EACCES)
    Permission denied @ rb_sysopen - C:/tools/ruby23/bin/sass.bat

I tried changing the security permission of C:\tools\ruby23 , but it didn't help. What went wrong ?