Complie error: Error occured while flattening model

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Complie error: Error occured while flattening model

Complie error: Error occured while flattening model

Feb-13-11 05:01:57

I'm copying the moon landing class from the ModelicaTutorialFritzson.pdf which comes with the program, page 25-26.
However, when I use the simulate function (also copied from the slides), an error occurred.
Please help.

This is the original code, I didn't modify anything:

Code:


>>class CelestialBody

constant Real g = 6.672e-11;

parameter Real radius;

parameter String name;

parameter Real mass;

end CelestialBody;



{CelestialBody}





>>class MoonLanding

parameter Real force1 = 36350;

parameter Real force2 = 1308;

protected

parameter Real thrustEndTime = 210;

parameter Real thrustDecreaseTime = 43.2;

public

Rocket apollo(name="apollo13");

CelestialBody moon(name="moon",mass=7.382e22,radius=1.738e6);

equation

apollo.thrust = if (time < thrustDecreaseTime) then force1

else if (time < thrustEndTime) then force2

else 0;

apollo.gravity=moon.g*moon.mass/(apollo.altitude+moon.radius)^2;

end MoonLanding;



{MoonLanding}



>>simulate(MoonLanding, stopTime=230)

record SimulationResult

    resultFile = "Simulation failed.

[b]Error: Error occured while flattening model MoonLanding[/b]

"

end SimulationResult;