Error in sisotool function controlSystemDesigner

This is the error i face when I call sisotool

Error using controlSystemDesigner (line 243) Output argument "angle" (and maybe others) not assigned during call to "angle".

Error in sisotool (line 88) h = controlSystemDesigner(varargin{:});

Error in exaple (line 11) sisotool(syst)

this is the code

s=tf('s');
syst= 1/(1+s)^2;
sisotool(syst)

or even simply

sisotool

I have removed Matlab 2017b completely and installed 2019b. Surprisingly, I still have trouble calling 'sisotool'. What should I do now?

[Mathieu NOE]

It works on my R2020b

have you removed or modified files in the toolbox ?

maybe you will have to reinstall your matlab

[Aria Arianpor]

Is't there any other way to dispense with reinstalling Matlab?

[Walter Roberson]

restoredefaultpath
rehash toolboxcache

and try again.

I suspect you have a third-party toolbox such as psat installed that is interfering with using the code.

[Aria Arianpor]

Thanks for your help, but it's made no defference

Answer 1

[Aria Arianpor]

I have removed Matlab 2017b completely and installed 2019b. Surprisingly, I still have trouble calling 'sisotool'. What should I do now?

[Walter Roberson]

dbstop if caught error

and then do a bunch of debugging.