![@string/ reference error](https://i.stack.imgur.com/T5q8E.png)

`android:text="Button"` doesn't work.
I should make a special string for it in the `values/strings.xml` and change the `android:text="Button"` to `android:text="@string/button"` for button having the value `"Button"`.

What's the problem it used to work before?