RF InvocationTargetException

I get an InvocationTargetException when I store my object on the
server side which I just don't understand.

I set a field of my bean to a server side class which is not exposed
by the proxy. I store the object in the database using the put method
from Objectify. Right then, when I am storing the object, the
exception is raised with the following message (returned by
ServerFailure.getMessage):
owner: com.metaaps.webapps.gwt.common.widget.server.login.User is not
a supported property type.

Any idea?

Thanks

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