need help on trouble shooting my Simulink controller model

I have created a simulink model for an inverted airfoil mounted on a moving cart (very similar to the inverted cart-pendulum). I created a subsystem from my plant model and then added a PID control loop around it. However, I'm getting this error:

I tried reducing the strep size in Solver under Configuration Parameters, but it did not work. Attached here is my model, could someone please give me some suggestions?

I also attached a PDF file that includes my derivation of equations of motion and the numerical values for each parameter I've used

[Salman Ahmed]

Hi,

Could you share the related parameter values loaded in your MATLAB workspace like m, l, g?

[Randy Chen]

yes I have all the constants defined in the PDF