"Invalid setting for parameter 'Gain' " while adding the integral action.

[Londu]

Hi,
I am trying to add an 'integral action' into the offshore monopile wind turbine model to remove the rotor speed regulation steady-state tracking error. In the MATLAB script, a tunable gain parameter is used to calculate the integral gain 'Ki', and a PID controller in the Simulink with an 'I' controller is selected. When I run the simulation, it gives this error:
Error using DAC (line 251)
Invalid setting in 'DAC_si/IPC/DAC/Integral action 'Ki'/I Gain/Internal Parameters/Integral Gain' for parameter 'Gain'.

I would appreciate it if anyone could help me on solving this. Thank you.