Installing rvm on cygwin occurred Permission denied

rvm_cygwin_permission_denied_log

$ bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
Downloading RVM from wayneeseguin branch stable
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   125  100   125    0     0     80      0  0:00:01  0:00:01 --:--:--   592
100  799k  100  799k    0     0   123k      0  0:00:06  0:00:06 --:--:--  183k

Upgrading the RVM installation in /home/xxx/.rvm/
cp: cannot open `/home/xxx/.rvm/src/rvm/patches/ree/1.8.7/zlib-gc-fix.diff' for reading: Permission denied
    RVM sourcing line found in: /home/xxx/.bashrc.

Upgrade Notes:

  * No new notes to display.

# RVM:  Shell scripts enabling management of multiple ruby environments.
# RTFM: https://rvm.beginrescueend.com/
# HELP: http://webchat.freenode.net/?channels=rvm (#rvm on irc.freenode.net)
# Screencast: http://screencasts.org/episodes/how-to-use-rvm

# In case of any issues read output of 'rvm requirements' and/or 'rvm notes'

Upgrade of RVM in /home/xxx/.rvm/ is complete.

# xxx,
#
#   Thank you for using RVM!
#   I sincerely hope that RVM helps to make your life easier and more enjoyable!!!
#
# ~Wayne