Input data dependency violation due to action subsystems. See Subsystem Examples in the Simulink library for valid and invalid examples of action subsystems

Hello every one,

I really need help , I am at uni studying aerospace engineering . I had the task to make and test landing gear system. I have done all the work and the model i created worked perfectly , So I decided just to tidy things up , i grouped few blocks into a subsystem. for each major parts of the system, however once i did that the simulink started given me errors i never occured before doing that. these are the errors that i am stuck with:

Input data dependency violation due to action subsystems. See Subsystem Examples in the Simulink library for valid and invalid examples of action subsystems
Component: Simulink | Category: Model error
Input ports (1, 2, Action) of 'LandingGear/Subsystem2/Isolation  Valve/Else Body subsystem' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem2/LG Selector  Valve/Switch1' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem2/LG Selector  Valve/Multiport Switch1' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 3) of 'LandingGear/Subsystem/LH Door Actuator/Multiport Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (2, 3) of 'LandingGear/Level-2 MATLAB S-Function' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) of 'LandingGear/LG Wheels Systems' are involved in the loop
Component: Simulink | Category: Block error
Input ports (2) of 'LandingGear/Subsystem1/Logical Operator' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2, 5) of 'LandingGear/Subsystem1/Emergency Valve/Multiport Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1) of 'LandingGear/Subsystem1/Emergency Valve/Compare To Constant1/Compare' are involved in the loop
Component: Simulink | Category: Block error
Input ports (2) of 'LandingGear/Subsystem1/Emergency hydraulic pump unit/Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem1/Emergency Valve/Switch1' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem2/LG Selector  Valve/Switch2' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem2/LG Selector  Valve/Multiport Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (2) of 'LandingGear/Subsystem2/Main hydraulic pum unit/Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2, 5) of 'LandingGear/Subsystem2/Isolation  Valve/Multiport Switch' are involved in the loop
Component: Simulink | Category: Block error
Input ports (1, 2) of 'LandingGear/Subsystem2/Isolation  Valve/If' are involved in the loop

Answer 1

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