Executing startup failed in matlabrc

I think i broke my matlab. A few days ago I seamingly deleted matlabs appdata. (I know stupid).

So i Installed a new version(2021b) becasued i had 2021a. Since then my matlab doesnt work the way it did.

I tried to run this simple code

close all;
clear all;

R = 1;
L = 10e-6;
C = 11e-6;

t_fun = tf([1 0],[L*C*R, L, R]);
bode(t_fun);
title("Übertragungsfunktion");

wich works in matlab online but not on my PC giving me this error

Check for incorrect argument data type or missing argument in call to function 'tf'.

So I am guessing the error comes from this error that I get from starting matlab.

Warning: Executing startup failed in matlabrc.

This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible. Error detected was:

MATLAB:UndefinedFunction

Undefined function 'pm_addunit' for input arguments of type 'char'.

I dont really know what to do here. I deinstalled Matlab2021b and reinstalled it twice already the error wont change. I tried running other simple code on matlab i used to have that works. But i dont really want to be suprised when I use matlab and dont know if the error comes from my faulty code or my broken programm.

[Matt J]

Do you have a startup.m file? If so, what's in it?

Answer 1

[Walter Roberson]

Something in your matlabrc is invoking something that tries to use pm_addunit() from the Simscape Physical Modeling Toolbox, but you do not have that toolbox installed.

pm_addunit() adds a new physical unit, so possibly someone thought that was a good idea to have happen automatically for all sessions instead of each project having to initialize the unit.

[Samuel the Helpless]

Oh okay, Thx i Installed the toolbox and the warning is gone.

But i still dont quite understand why the code that I made doesnt work offline but if i try it in matlab online editor it works.

Check for incorrect argument data type or missing argument in call to function 'tf'.

Error in abgabe6 (line 8)

t_fun = tf([1 0],[L*C*R, L, R],-1);

I dont get why it doesnt work if it works online but not here. It said i need a toolbox and I installed one but it still is not working.