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My ROS core is running in my PC and i launch the subscriber node from my android tablet. This error log only appears when i try my subscriber to custom message. If i try it to a std_msgs.String for example it works. My master uri is well defined because i can check it when debugging the app. it looks like: http://localhost:11311 where local host is: 138.100.76.196 and is named: arturo-desktop I don't know why this error only begins with this subscriber. Any suggestion? Thanks for helping!!