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It looks like there is a problem with your rosserial_python installation. You have a setup mixed up between python 2 and 3. I suspect you installed rosserial_python with pip3. Uninstall it there and install it with 'sudo apt install ros-melodic-rosserial-python'.

It looks like there is a problem with your rosserial_python installation. You have a setup mixed up between python 2 and 3. I suspect you installed rosserial_python with pip3. Uninstall it there and install it with 'sudo sudo apt install ros-melodic-rosserial-python'. ros-YOURDISTRO-rosserial-python.