OMEdit 1.12 simulate fails with parameter but works when changed to constant

[Vestal]

Seems like a bug in verison 1.12.0 of 3 May 2017
model SpinArtistry
import Modelica.SIunits;
import Modelica.Mechanics.MultiBody.Frames.Orientation;
import Modelica.Mechanics.MultiBody.Frames.axisRotation;
import Modelica.Mechanics.MultiBody.Visualizers;
import Modelica.Mechanics.MultiBody.Frames;
import Modelica.Mechanics.MultiBody.Types.Color;

Running "simulate" on this model will result in a
Translation Error "The given system is mixed-determined.
[index > 3]"
If you comment/uncomment the following lines to change
the following declaration from a parameter to a constant,
it will succeed.
parameter SIunits.AngularVelocity der_angle = 10.0;
constant SIunits.AngularVelocity der_angle = 10.0;

parameter Frames.Orientation Rtilt = Frames.axisRotation(3, -0.7, 0);
constant Frames.Orientation Rtilt = Frames.axisRotation(3, -0.7, 0);
SIunits.Angle angle;
Frames.Orientation R;

initial equation

angle = 0.0;
R = Frames.absoluteRotation(Frames.Orientation(T=identity(3),w={0,der_angle,0}), Rtilt);

equation

der_angle = der(angle);
R = Frames.absoluteRotation(Frames.axisRotation(2, angle, der_angle), Rtilt);

end SpinArtistry;

[anonymous]

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