Got UmbrellaException when trying to show loading screen on async login processing using MaterialLoading

Hello,

I have a little problem here, which I try to figure out why it is happening.

I use GWT Material Design in my project, and I just wanted to show a loading screen while the login is being processed, but I get an UmbrellaException, and the loading icon just spins there forever...

If I just remove MaterialLoader.showLoading(true); and MaterialLoader.showLoading(false); everything works.

Does anybody know why this is happening ?

private static void performUserConnection(String username, String password) {

    MaterialLoader.showLoading(true);

    DBConnectionAsync rpcService = (DBConnectionAsync) GWT.create(DBConnection.class);

    ServiceDefTarget target = (ServiceDefTarget) rpcService;

    String moduleRelativeURL = GWT.getModuleBaseURL() + "DBConnectionImpl";

    target.setServiceEntryPoint(moduleRelativeURL);

    rpcService.authenticateUser(username, password, new AsyncCallback<User>() {

        @Override

        public void onSuccess(User user) {

            MaterialLoader.showLoading(false); // Does not get here

            // ...

            if (user.getType().equals("User")) {

                presenter.goTo(new UserPlace(username));

            } else if (user.getType().equals("Admin")) {

                presenter.goTo(new AdminPlace(username));

            }

        }

        @Override

        public void onFailure(Throwable caught) {

            MaterialLoader.showLoading(false); // Does not get here

            if (caught instanceof InvalidCredentialsException) {

                MaterialToast.fireToast(caught.getMessage(), "rounded");

            } else {

                MaterialModal materialModal = ModalCreator.createModal("Something went wrong", caught);

                RootPanel.get().add(materialModal);

                materialModal.open();

            }

        }

    });

}

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