MATLAB: Do I get the error “The feature ‘RTWTesting’ has already been registered.” when launching Simulink

simulink

When I tried to launch Simulink and opened Simulink model, I got the following error and couldn't open it.

Error using open (line 146)

The feature 'RTWTesting' has already been registered.

At first, please try initialization for MATLAB preference folder and MATLAB path.

To initialize MATLAB preference folder, please rename it. You can confirm MATLAB preference folder.

>>prefdir

To initialize MATLAB path, please run the following commands from Command Window.

restoredefaultpath
rehash toolboxcache
savepath

If the issue hasn't resolved, you might fail to install MATLAB/Simulink.

Therefore, please try clean installation MATLAB as an administrator referring the following URL.