Launching roscore in groovy fails

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Hi,

I'm testing the new ros-groovy release and for some reason I cannot launch roscore:

I have the following version of ros installed:

$ dpkg -l ros-groovy-ros-comm
...
ii  ros-groovy-ros-comm  1.9.39-0precise-2012

After sourcing /opt/ros/groovy/setup.bash my environment looks like this:

env | grep ros
ROS_ROOT=/opt/ros/groovy/share/ros
ROS_PACKAGE_PATH=:/opt/ros/groovy/share:/opt/ros/groovy/stacks
LD_LIBRARY_PATH=/opt/ros/groovy/lib:/opt/halcon/lib/x64-linux2.4-gcc40
CPATH=/opt/ros/groovy/include
PATH=/opt/ros/groovy/bin:/opt/halcon/bin/x64-linux2.4-gcc40:/opt/halcon/FLEXlm/x64-linux2.4-gcc40:/home/rsmits/eclipse:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
PWD=/home/rsmits/ros-groovy-empty
PYTHONPATH=/opt/ros/groovy/lib/python2.7/dist-packages
PKG_CONFIG_PATH=/opt/ros/groovy/lib/pkgconfig
CMAKE_PREFIX_PATH=/opt/ros/groovy
ROS_ETC_DIR=/opt/ros/groovy/etc/roslib

launching roscore however fails as follows:

$roscore
... logging to /home/rsmits/.ros/log/e2ef1f84-5aff-11e2-98eb-c86000bfbac0/roslaunch-im-desktop-01-6764.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Cannot locate [roslaunch]Invalid <param> tag: Cannot load command parameter [rosversion]: command [rosversion roslaunch] returned with code [1]. 

Param xml is <param command="rosversion roslaunch" name="rosversion"/>

executing rosversion roslaunch results in the following error:

$rosversion roslaunch
Cannot locate [roslaunch]

rospack however indicates that the roslaunch is definitely installed:

$rospack find roslaunch 
/opt/ros/groovy/share/roslaunch

Does anyone have any idea what I did wrong??