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It appears the serial node module hasn't been properly updated to Python 3 which Ros Noetic uses, The init file for the rosserial_python package needs to be changed so that it can find SerialClient.py.
The location of the init file that i needed to change.
<your workspace="">/src/rosserial/rosserial_python/src/rosserial_python/__init__.py
The issue will be solved by adding a dot in front of SerialClient
from SerialClient import *
from .SerialClient import *
It might be that SerialClient.py will have issues importing some libraries as for they where still configured for python 2. I needed to change the import for Stringio and Queue as well
They are working on updating rosserial so that it will support python 3: https://github.com/ros-drivers/rosserial/pull/480
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