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First, please add the full error message and put it in the right formatting.

Here are a few things I noticed in your problem description:

Does your library build at all? I see the missing dependency on pluginlib.

I see a spelling mistake in your CMakeLists.txt: add_library(lib_mynodelete src/mynodelet.cpp)

Finally, please make sure that the below really points to your xml file.

<export>
  <nodelet plugin="${prefix}/mynodelet.xml" />
</export>

Hope this helps!

First, please add the full error message and put it in the right formatting.

Here are a few things I noticed in your problem description:

Does your library build at all? I see the missing dependency on pluginlib.

I see a spelling mistake in your CMakeLists.txt: add_library(lib_mynodelete src/mynodelet.cpp)

Finally, please make sure that the below really points to your xml file.

<export>
  <nodelet plugin="${prefix}/mynodelet.xml" />
</export>

Hope this helps!

PS: This is the command, which lists all the available nodelet plugins:

rospack plugins --attrib=plugin nodelet