title: java.lang.NoSuchMethodError: No static method isAtLeastR()Z
body: <p>My app was running fine but suddenly I started getting this error</p>
  
  <blockquote>
    <p>java.lang.NoSuchMethodError: No static method isAtLeastR()Z in class Landroidx/core/os/BuildCompat; or its super classes (declaration of 'androidx.core.os.BuildCompat' appears in /data/app/com.app.goflatmates-RZKwS2h6hav==/base.apk)
            at com.google.android.gms.common.util.PlatformVersion.isAtLeastR(com.google.android.gms:play-services-basement@@17.2.0:21)
            at com.google.android.gms.common.api.GoogleApi.zaa(com.google.android.gms:play-services-base@@17.2.0:128)
            at com.google.android.gms.common.api.GoogleApi.(com.google.android.gms:play-services-base@@17.2.0:23)
            at com.google.android.gms.common.api.GoogleApi.(com.google.android.gms:play-services-base@@17.2.0:54)
            at com.google.android.gms.auth.api.signin.GoogleSignInClient.(Unknown Source:3)
            at com.google.android.gms.auth.api.signin.GoogleSignIn.getClient(Unknown Source:3</p>
  </blockquote>
  
  <p><strong>The problem is coming in this line</strong></p>
  
  <pre><code>GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                  .requestEmail()
                  .build(); 
  
  mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
  </code></pre>