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This is not a problem with your launch file but that roslaunch cannot find the package pow_analyzer. Is the package in your ROS_PACKAGE_PATH. You can verify that your ROS environment is set up correctly by either doing a roscd pow_analyzer which must work or by executing:
rospack find pow_analyzer
which must print the path to the package pow_analyzer. If one of the commands fails, pow_analyzer is not in your ROS_PACKAGE_PATH.
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