Calling Java class in Simulink "Matlab function"-block

Hi guys,

I would like to run a .m-file in my Simulink model. I used the "Matlab function"-block to implement the .m file in the model. Within the .m file, a Java function is called. (oldState = jat.matlabInterface.PropagatorAdaptor.RK8(eoms,time, x0, stepSize, jatPath);).

At this point, I get the following error message: Call to MATLAB function aborted: No method 'RK8' with matching signature found for class 'jat.matlabInterface.PropagatorAdaptor'.

Would anyone have an idea how to fix this? Do I need to define the location of the Java class?

Any help would be appreciated. Thanks Julian