Let's start to just get the plugin work for you, and then move to the skin.
This error message "Pls enter a valid ComPort in Configuration File and restart" will shown when the plugin don't get a valid comport from the .ini file. There are 2 possibilities.
1) You have not entered a comport between 1-16.
2) The plugin does not find the .ini file (default comport are 0)
my guess are #2, Q1: Are you using legacy or profile mode?
You should also check what comport you are using for your ibus interface, there is no "default" comport number as it could be anything. (ex. if your interface have FTDI USB bridge, comport 3 is often used).
BTW the plugin don't use "reverse gear" to trigger, it trigger when the oem PDC goes active. This way it will also work when you manually push the "PDC button" in the front.