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Replace

PLUGINLIB_DECLARE_CLASS(depthimage_to_laserscan, DepthImageToLaserScanNodelet, depthimage_to_laserscan::DepthImageToLaserScanNodelet, nodelet::Nodelet);

with

PLUGINLIB_EXPORT_CLASS(depthimage_to_laserscan::DepthImageToLaserScanNodelet, nodelet::Nodelet);

this should work!!

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