错误：找不到属性的资源标识符

Question

我不是Visual Studio代码方面的专家。尝试重建项目时出现此错误：

Severity    Code    Description Project File    Line    Suppression State Error
No resource identifier found for attribute 'overlaySurface' in package 'com.fleeped.messenger'  Fleeped  C:\Users\-\Desktop\Messenger\Resources\layout\TwilioVideoCallActivityLayout.axml   2

有什么想法请解决此问题吗？

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="schemas.android.com/apk/res/android"
        xmlns:app="schemas.android.com/apk/res-auto"
        android:id="@+id/activity_video_chat_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/secound_color"
    >
...