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In my case: I am using python. I face same error. I was following this tutorial link text

The problem was ROS command "catkin_make install" (the last step of generating message) was not creating the code required to be generated for custom messages, for python, cpp and lisp, which basically helps python to understand the import statement. this generated code gets generated in :

~/catkin_ws/devel/lib/python2.7/dist-packages/package-name/msg (in case of python)

The solution : The problem was, In the tutorial I followed link text

find the lines :

catkin_package( ...
CATKIN_DEPENDS message_runtime ...
...)

I uncommented this lines. I dont know why this step shows that it is uncommented. I commented it and run the last step

catkin_make install

which made the required code in --

~/catkin_ws/devel/lib/python2.7/dist-packages/package-name/msg

check if it works: open terminal (ctrl+alt+T) you should already be running

roscore

in another terminal already move to your workspace by -

cd ~/workspace-name

source it-

source devel/setup.bash

type

python

and hit enter (to open python interpreter)

now enter command -

from package-name.msg import custom_msg

eg:

from std_msgs.msg import String

if you dont see any error you are done.