Is the excessive use of the Derivative block the cause of my problem ??

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kamal kiki
kamal kiki 2018-5-9
Hi everyone,
I built a simulink model in which I was obliged to use the derivative block many times. But each time I run the simulation it stops and I have the error message below:
a =
0.2831
a =
1.0298e+11
a =
4.8985e+30
a =
1.0973e+89
An error occurred while running the simulation and the simulation was terminated
Caused by:
Error in 'board_with_derivatives/calculation of Y_0_dd /Interpreted MATLAB Function'. Evaluation of expression resulted in an invalid output. Only finite double vector or matrix outputs are supported
Also I used the unit delay block many times in order to break the algebraic loops.
I have attached to this question the simulink model and the m-file containing the necessary parameters for running the simulation.
Any help is appreciated.
Thank you very much in advance.

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