title: How do I update all libraries, after Migrating to AndroidX?
body: <p>I've have recently migrated my app to AndroidX, blindly without knowing the ins and outs. As a result every time I run the project, it gives me a load of errors.</p>
  <p>I have updated all my Gradle Dependencies and targetSDK to the most recent version code. I have also added the following to gradle.properties:</p>
  <pre><code>android.useAndroidX=true 
  android.enableJetifier=true
  </code></pre>
  <p>But this has still made no difference.</p>
  <p>Some of the following are examples of errors I am getting:</p>
  <blockquote>
  <p>error: package android.support.annotation does not exist</p>
  <p>error: package android.support.v7.widget does not exist</p>
  <p>error: package RecyclerView does not exist</p>
  <p>error: cannot find symbol class FragmentActivity</p>
  <p>error: cannot find symbol class CardView</p>
  <p>error: cannot find symbol class FragmentPagerAdapter</p>
  <p>error: cannot find symbol class DialogFragment</p>
  </blockquote>
  <p>I would just like to know I can get rid of these errors, as it is stopping me from running the project on my mobile device?</p>