Error evaluating 'MaskCallback' callback

Hi, i'm trying to create some Initial settings for my neural network. I created a block with some paremeters then in the Initialization window i used this code

eStr = eq_initmask(gcb,'init');
    
if ~isempty(eStr.emsg)
  errordlg(eStr.emsg, 'Equalizer Demo', 'replace');
end

if ~isempty(eStr.emsg_w) 
  warndlg(eStr.emsg_w, 'Equalizer Demo', 'replace');
end

But when i run simulation i got this error

Error evaluating 'MaskCallback' callback of SubSystem block (mask) 'eq_sim_CRNN_4QAM/Initial Settings'. Undefined function 'eq_initmask' for input arguments of type 'char'

Can anyone help me? I'm not really good with matlab. Oh, this works fine with matlab 6.5. But when I try it with matlab R2016a I got this problem.