Arduino tutorial: compile error in Arduino IDE

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I'm working on the rosserial_arduino/Tutorials/Hello World tutorial and when I compile the example code I get this error message:

In file included from /home/ryan/sketchbook/libraries/ros_lib/ros.h:38:0, from HelloWorld.cpp:6: /home/ryan/sketchbook/libraries/ros_lib/ros/node_handle.h:39:38: fatal error: rosserial_msgs/TopicInfo.h: No such file or directory compilation terminated.

I've tried copying and pasting files and folders with no luck. I'm thinking maybe Arduino can't find my ros_workspace folder?

UPDATE: I repeated the tutorial and discovered that rosmake fails after the command: rosmake rosserial_arduino. The rosmake summary reads like this: [ rosmake ] Output from build of package rosserial_arduino written to: [ rosmake ] /home/ryan/.ros/rosmake/rosmake_output-20120514-181947/rosserial_arduino/build_output.log [rosmake-0] Finished <<< rosserial_arduino [FAIL] [ 6.52 seconds ] [ rosmake ] Halting due to failure in package rosserial_arduino. [ rosmake ] Waiting for other threads to complete. [ rosmake ] Results: [ rosmake ] Built 17 packages with 1 failures. [ rosmake ] Summary output to directory [ rosmake ] /home/ryan/.ros/rosmake/rosmake_output-20120514-181947

What would cause rosmake to fail?