Cannot check out the mit-ros-pkg code

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When I try step 5 "rosinstall ~/kinect_demos /opt/ros/diamondback kinect_demos.rosinstall"(http://www.ros.org/wiki/mit-ros-pkg/KinectDemos/dback), then the error information as below:

root@ubuntu:~# rosinstall ~/kinect_demos /opt/ros/diamondback kinect_demos.rosinstall
rosinstall operating on /home/tansir/kinect_demos from specifications in rosinstall files  /opt/ros/diamondback, kinect_demos.rosinstall
(Over-)Writing /home/tansir/kinect_demos/.rosinstall
[perception_pcl_addons] Installing https://code.ros.org/svn/ros-pkg/stacks/perception_pcl_addons/trunk (None) to /home/tansir/kinect_demos/perception_pcl_addons
[perception_pcl_addons] Done.
[mit-ros-pkg] Installing https://svn.csail.mit.edu/mit-ros-pkg/trunk (None) to /home/tansir/kinect_demos/mit-ros-pkg
WARNING [vcstools] Command failed: 'svn co  "https://svn.csail.mit.edu/mit-ros-pkg/trunk" /home/tansir/kinect_demos/mit-ros-pkg'
 errcode: 1:
svn: warning: cannot set LC_CTYPE locale
svn: warning: environment variable LANG is en_US.UTF-8
svn: warning: please check that your locale name is correct
Error validating server certificate for 'https://svn.csail.mit.edu:443':
 - The certificate is not issued by a trusted authority. Use the
   fingerprint to validate the certificate manually!
Certificate information:
 - Hostname: svn.csail.mit.edu
 - Valid: from Wed, 15 Jun 2011 13:29:37 GMT until Thu, 14 Jun 2012 13:29:37 GMT
 - Issuer: MIT Computer Science & Artificial Intelligence Lab, Cambridge, Massachusetts, US
 - Fingerprint: f2:1b:58:1c:eb:c1:a2:ed:ea:fc:87:96:f0:fa:80:92:59:ae:27:92
(R)eject, accept (t)emporarily or accept (p)ermanently? svn: OPTIONS of 'https://svn.csail.mit.edu/mit-ros-pkg/trunk': Server certificate verification failed: issuer is not trusted (https://svn.csail.mit.edu)
[/vcstools]
[mit-ros-pkg-experimental] Installing https://svn.csail.mit.edu/mit-ros-pkg/branches/sandbox (None) to /home/tansir/kinect_demos/mit-ros-pkg-experimental

WARNING [vcstools] Command failed: 'svn co  "https://svn.csail.mit.edu/mit-ros-pkg/branches/sandbox" /home/tansir/kinect_demos/mit-ros-pkg-experimental'
 errcode: 1:
svn: warning: cannot set LC_CTYPE locale
svn: warning: environment variable LANG is en_US.UTF-8
svn: warning: please check that your locale name is correct
Error validating server certificate for 'https://svn.csail.mit.edu:443':
 - The certificate is not issued by a trusted authority. Use the
   fingerprint to validate the certificate manually!
Certificate information:
 - Hostname: svn.csail.mit.edu
 - Valid: from Wed, 15 Jun 2011 13:29:37 GMT until Thu, 14 Jun 2012 13:29:37 GMT
 - Issuer: MIT Computer Science & Artificial Intelligence Lab, Cambridge, Massachusetts, US
 - Fingerprint: f2:1b:58:1c:eb:c1:a2:ed:ea:fc:87:96:f0:fa:80:92:59:ae:27:92
(R)eject, accept (t)emporarily or accept (p)ermanently? svn: OPTIONS of 'https://svn.csail.mit.edu/mit-ros-pkg/branches/sandbox': Server certificate verification failed: issuer is not trusted (https://svn.csail.mit.edu)
[/vcstools]
[motion_planning_common] Installing https://code.ros.org/svn/wg-ros-pkg/stacks/motion_planning_common/tags/unstable (None) to /home/tansir/kinect_demos/motion_planning_common
[motion_planning_common] Done.
exception caught Error processing 'mit-ros-pkg' : [mit-ros-pkg] Checkout of https://svn.csail.mit.edu/mit-ros-pkg/trunk version None into /home/tansir/kinect_demos/mit-ros-pkg failed.
Error processing 'mit-ros-pkg-experimental' : [mit-ros-pkg-experimental] Checkout of https://svn.csail.mit.edu/mit-ros-pkg/branches/sandbox version None into /home/tansir/kinect_demos/mit-ros-pkg-experimental failed.

ERROR in config: Error ...