title: Jetpack compose can't preview after updating to 1.0.0-rc01
body: <p>this happened to me only when I updated to 1.0.0-rc01.
  it says:</p>
  <blockquote>
  <p>The following classes could not be found:
  - androidx.compose.ui.tooling.preview.ComposeViewAdapter (Fix Build Path, Edit XML, Create Class)</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/Cg5Sr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Cg5Sr.png" alt="enter image description here" /></a></p>
  <p>my code:</p>
  <pre><code>@Composable
  @Preview
  fun CenterProgress(){
      Box(
          modifier= Modifier.fillMaxSize(),
          contentAlignment = Alignment.Center
      ){
          CircularProgressIndicator(strokeWidth = 3.dp)
      }
  }
  </code></pre>