fuerte rospack package/stack not found
hi, today i found that my "rospack" cannot find any existing package / stack inside my sandbox! My ROS_PACKAGE_PATH is correct, so I don't know what's wrong with my fuerte, and I am using Ubuntu12.04... because yesterday i tried to install Moveit (for groovy) into my fuerte, does it matter? and I want to know how to fix it!... thanks!