Rosserial Arduino custom message not being generated

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I have made a custom message called gas_msg.msg. It is located in a package named gas_sensor_msg. The custom message has been created with catkin_make. I am now trying to make the custom message files in the Arduino libaries using the command "rosrun rosserial_arduino make_libraries.py ~/Arduino/libraries/ gas_sensor_msg". I first delete the old ros_lib before running the command, but it is not creating header files for the new custom message. It is only replacing the old default messages.

Any help is appreciated. Thanks!