title: Unresolved class in tool.context
body: <p>When I create a new project have an error </p>
  
  <blockquote>
    <p>"Unresolver class "MainActivity" in tool.context=".MainActiviity"</p>
  </blockquote>
  
  <p>If I click "run app" it shows that default activity not found</p>
  
  <p>Tried to write like this: tool.context = "com.example.android.myapplication", but it still reports that default activity not found. Projects that worked fine a few days ago now have this problem too.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;androidx.constraintlayout.widget.ConstraintLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".MainActivity"&gt;
  </code></pre>