TOMCAT GUI import data error

Dear all,

I am new Matlab user, and I am using TOMCAT toolbox GUI, but I can't seem to import data either .mat file or from the workspace. It gives me the following error:

     No public field (my data) for class matlab.graphics.Graphics.

     Error in TOMCAT>import_form_workspace_Callback (line 145)
         data.(content{selection(i)})=evalin('base',content{selection(i)});

     Error in gui_mainfcn (line 95)
          feval(varargin{:});

     Error in TOMCAT (line 28)
          gui_mainfcn(gui_State, varargin{:});
 
     Error while evaluating Menu Callback

I think the error comes from this part of the GUI code:

     function import_form_workspace_Callback(hObject, eventdata, handles)

     data=get(gcf,'Userdata');
     content=evalin('base','who');
     [selection,ok]=listdlg('PromptString','Select data to import:','Name','Data selection',... 'SelectionMode','multiple','ListString',content);

     if ok==0; return; end

     for i=1:length(selection)
         data.(content{selection(i)})=evalin('base',content{selection(i)});
     end

     set(gcf,'Userdata',data)

Is there anyone who has encountered similar problem and aware of the solution? I appreciate very much any help. I am using Matlab R2014b. Thank you.