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It's a bug that it's not caught, but it also means your network is not configured properly. It's important that you have a proper network setup if you intend to use ROS with remote machines.

In this case, RoboIcaro is not a valid hostname, which is why roslaunch is raising an exception.

Please read: http://www.ros.org/wiki/ROS/NetworkSetup

for a guide on how to test your network config.

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