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It looks to me like

<[...] args="load rgbdslam/FeatureNodelet openni_camera" output="screen" />

needs to be changed to

<[...] args="load rgbdslam/FeatureNodelet openni_manager" output="screen" />

It looks to me like

<[...] args="load rgbdslam/FeatureNodelet openni_camera" output="screen" />

needs to be changed to

<[...] args="load rgbdslam/FeatureNodelet openni_manager" output="screen" />

EDIT 1

Well, everything looks like it should work. The error you're getting means the nodelet was never exported properly - it's not on the list of nodelets that ROS knows about. What is the output when you compile rgbdslam?

Also, if I can take a look at the whole .cpp, .h, CMakeList and .xml files, I might be able to help further

It looks to me like

<[...] args="load rgbdslam/FeatureNodelet openni_camera" output="screen" />

needs to be changed to

<[...] args="load rgbdslam/FeatureNodelet openni_manager" output="screen" />

EDIT 1

Well, everything looks like it should work. The error you're getting means the nodelet was never exported properly - it's not on the list of nodelets that ROS knows about. What is the output when you compile rgbdslam?

Also, if I can take a look at the whole .cpp, .h, CMakeList and .xml files, I might be able to help further

EDIT 2

There's a closing bracket missing in the rosbuild_add_library line - is that how it got displayed here, or also in your file?