error: Port 2 of 'final/Subsystem4/Subsystem2/Switch Case' can only be connected to an action subsystem and may not be connected to more than one action subsystem
错误原因：
The output of the "Switch Case" block is a trigger. It can only trigger one subsystem. If you need to trig more than one, you can probably put all the things that you want to trig inside the "Switch Case Action Subsytem".
You can add as many Inport blocks as you want.
