ImportError: No module named msg

edit

Hey, I'm a new ROS user and tried to use actionlib. I created a new package 'tuck_arms_server' and defined the message in .action file. After compiling the package, the msg folder is automatically created. But then my python code, I wanted to do this: "import from tuck_arms_server.msg import *", but I got the error: ImportError: No module named msg.

some relevant lines in my code: import roslib; roslib.load_manifest('tuck_arms_server');

in CMakeLists.txt:(just followed the tutorial)

rosbuild_find_ros_package(actionlib_msgs)
include(${actionlib_msgs_PACKAGE_PATH}/cmake/actionbuild.cmake)
genaction()

also added this line to the manifest file:

<depend package="actionlib_msgs"/>

So why cant it recognize msg in my package tuck_arms_server ? Thanks in advance.:-)