error when running "nnstart"

After running the

nnstart

command, the the window pop up and after selecting fiting, pattert recognition or any thing below error apears on Command Window

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback

Error while evaluating Button PrivateButtonPushedFcn

[Vinayak]

Does the issue still recurr after restarting MATLAB/Simulink?

If the above does not help, you can try to restore the default path and rehash toolbox cache as explained here:

https://www.mathworks.com/matlabcentral/answers/2052722-how-can-i-perform-initial-troubleshooting-of-matlab-or-simulink-errors