Strange error

hey everybody! recently I tried to run the code from this video : . But I have the following error from the text file.
Can somebody please help me out?
message.txt (37.5 KB)

You should go to

And the adapt the example

Because the example is with an old Vaadin version

Thanks! Do you also know or have any links that might help me create a register/login page, because on the site given I can’t connect the components

You have to go to the settings page. There you can see security

It’s access control settings

and further? because all what it shows is :

Now you download it