ERROR: While executing gem ... (ArgumentError) invalid byte sequence in UTF-8

gistfile1.txt

In Windows environment, the error is occured when executing "gem install compass" in cygwin.
$ gem install compass
ERROR:  While executing gem ... (ArgumentError)
    invalid byte sequence in UTF-8

How to solve:
1) open C:\cygwin\usr\share\ruby\2.0.0\win32\registry.rb
(change to your version when necessary)

2) comment out line 172 and change "\r" to "\r\n" in line 173 (line numbers may vary)
from
----------------------
msg = msg[0, len].force_encoding(Encoding.find(Encoding.locale_charmap))
super msg.tr("\r", '').chomp
----------------------
to
----------------------
#msg = msg[0, len].force_encoding(Encoding.find(Encoding.locale_charmap))
super msg.tr("\r\n", '').chomp
----------------------

done.

Reference:
https://bugs.ruby-lang.org/issues/8508