在visual studio中找不到属性Xamarin的资源标识符

Question

我已将xamarin更新为stable。我还更新了所有sdks但是在构建xamarin.forms项目时我仍然遇到此错误..

Build FAILED.

Resources\layout\Tabbar.axml(2): error APT0000: No resource identifier found for attribute 'tabIndicatorColor' in package 'App1.Droid'
Resources\layout\Tabbar.axml(2): error APT0000: No resource identifier found for attribute 'tabGravity' in package 'App1.Droid'
Resources\layout\Tabbar.axml(2): error APT0000: No resource identifier found for attribute 'tabMode' in package 'App1.Droid'