Why toolbox FDATOOL didn't show up again in my MATLAB environment?

I've used FDATOOL to analyse my signal, but suddenly today the FDATOOL box did't appear anymore. In command window each time i tried to use FDATOOL,there's only message:

>> fdatool

ans =

     FilterStructure: 'Direct-Form FIR'
          Arithmetic: 'double'         
           Numerator: [1x62 double]    
    PersistentMemory: false

Has anyone ever experienced the same problem?

Thanks,

Answer 1

[Walter Roberson]

In R2016b fdatool was renamed to filterDesigner

http://www.mathworks.com/help/releases/R2016b/signal/release-notes.html