roslaunch cannot find package

edit

I have written a .launch file for a CAN bus reader, but roslaunch simple does not see it, and I can't figure out what I'm doing wrong. It is especially disconcerting as every other node I've got works just fine.

package.xml:

<package>
  <name>canbus_read</name>
  <version>0.0.1</version>

  <description>Can_Bus_ROS_Reader</description>

  <maintainer email="bart.milne@pg.canterbury.ac.nz">Bart Milne</maintainer>
  <author>Bart Milne</author>

  <license>BSD</license>

  <url type="website"></url>

  <buildtool_depend>catkin</buildtool_depend>

  <build_depend>roscpp</build_depend>

  <run_depend>roscpp</run_depend>

</package>

Launch file:

<!-- %Tag(FULL)%-->
<launch>
    <node name="candump" type="candump" pkg="canbus_read" output="screen" args="any" />
</launch>
<!-- %EndTag(FULL)%-->

The program's name iscandump.