Error in at running GUIDE apps

Dear all,

I have a problem for any GUIDE program I do. I try to use old and new code and I always have the same error. I could just create a brand new GUIDE with just a push button, and still I have the same error. This is weird, since I am not importing any old "not supported functions" should not be an issue. Moreover, the code still run and after appear to work after signaling the error!

Error using feature
HGUsingMATLABClasses will be removed in a future release. Use
~verLessThan('matlab','8.4.0') instead.

Error in gui_mainfcn>local_openfig (line 289)
    if feature('HGUsingMATLABClasses')

Error in gui_mainfcn (line 159)
        gui_hFigure = local_openfig(gui_State.gui_Name, gui_SingletonOpt,
        gui_Visible);

Error in ChanStag_Splitter (line 23)
    gui_mainfcn(gui_State, varargin{:});

I recently upgraded from Matlab R2013 to R2016b (accademic use). I did not found a post where such issue was described.

Is GUIDE still supported? Would you recommend to move to use the AppDesigner? (it would just be a hassle to learn the new function/code)

I attach the .m file and .fig file

Thank you very much,