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Excuse me, May I ask you if you have executed the next command?
echo $ROS_PACKAGE_PATH
I guess that your issue has relation to the fact that your computer can't find your source. I think you should add following to .bashrc.
export ROS_PACKAGE_PATH=~/workspace/src
More detail is described on this web ( http://wiki.ros.org/ROS/EnvironmentVariables ). I hope your issue is going out.