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Thank you for your attention, Now I have another error:

When I run "rosrun urg_node getID /dev/ttyUSB0" I get this error:

terminate called after throwing an instance of 'std::length_error'

what(): vector::_M_fill_insert

Aborted (core dumped)

and when I try to run the urg_node by "rosrun urg_node urg_node" I get this one:

[ERROR] [1435311379.106125299]: Unknown error connecting to Hokuyo

can you please help me solve this problem?

Thank you very much for your help