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I have a different error when I type this command : nada@nada-Satellite-A665:~$ rosservice call /objects_database_node/get_model_list REDUCED_MODEL_SET

the shell tells me that : ERROR: Unable to communicate with service [/objects_database_node/get_model_list], address [rosrpc://grasp.willowgarage.com:15432]

what should I do ?

I have a different error when I type this command : nada@nada-Satellite-A665:~$ $ rosservice call /objects_database_node/get_model_list REDUCED_MODEL_SET

the shell tells me that : ERROR: Unable to communicate with service [/objects_database_node/get_model_list], address [rosrpc://grasp.willowgarage.com:15432]

what should I do ?