Dictionary saveChanges in Java through feval

Hi,

I am trying to save a dictionary file that I modified in Java by executing

engine.feval("saveChanges", myDictionaryObjHandle);

but this throws the following error:

"No method 'saveChanges' with matching signature found for class 'Simulink.data.Dictionary'"

In MATLAB's command line, executing the following works fine

saveChanges(myDictionaryObjHandle)

What am I doing wrong?

Thanks.