Error at Themes/Data.dart

Im getting a lot of errors in line 10 since displayLarge, displayMedium, displaySmall and others aren't a property of TextTheme. How do i fix this?
<img width="980" alt="Screen Shot 2022-01-17 at 15 16 59" src="https://user-images.githubusercontent.com/48803163/149786088-54295047-1f6e-4e2a-8eec-0d46d04a52cb.png">
 