Get error: 'utils.ios.getter() is deprecated; use the respective native property instead'

Hey,
I’m on the way to get comfortable with nativescript and I’m going to use it to create a nice login form for my app project for ios and android. I found the sample code " Building a Good-Looking Login Form" in the nativescript marketplace under samples. But if I want to use it and create some user with the sign up button the error in the log comes up = utils.ios.getter() is deprecated; use the respective native property instead. The same with the login button. At the beginning it seems to work but if I retry the login or sign up it does not work.
Have anyone a solution to this issue?
And by the way I think it is offered in the marketplace and seems to have a bug^^