rosws problem fuerte

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I had the same problem as described by the original post, but the ROS version is Groovy. Yes, I did run the setup.bash of the new workspace, but still I got the message:

ERROR in config: Command requires a target workspace.

I discovered, that I had to run rosws set inside the workspace directory, i.e.

rosws set ~/ros_workspace/sandbox

does not work, but

cd ~/ros_workspace/; rosws set sandbox

does work

I have installed ros electric before, this time I am trying to install fuerte, encountered the same problem. I am not sure whether the same steps stated on

http://www.ros.org/wiki/ROS/Tutorials/InstallingandConfiguringROSEnvironment http://www.ros.org/wiki/fuerte/Installation/Overlays http://www.ros.org/wiki/ROS/EnvironmentVariables

are the correct way or not... To me, using the command

rosws init ~/fuerte_workspace /opt/ros/fuerte

seems not work.

But after I tried the steps on this page http://www.ros.org/doc/api/rosinstall/html/rosws_tutorial.html solved. Need to make the directory first and run the rosws init inside the folder. It just overwrite the setup.sh and some other setting files.

However, during the operation I have installed several python packages, do not know whether it affects or not. One thing can be confirmed, that if you go through all the webpages listed above, rosws init will be done.