title: All com.android.support libraries must use the exact same version 'com.android.support:appcompat-v7:28.0.0-rc01'
body: <p>Okay guys, hello. I'm new here (this is my first post, so if I have done anything wrong please forgive me and let me know! ). Could you please help me with this problem. I'm really stuck. check the red underlined line on Screenshot below (dependencies) . </p>
  
  <p>Android Error: </p>
  
  <p>All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0-rc01, 26.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0-rc01 and com.android.support:support-media-compat:26.1.0 less... (Ctrl+F1) 
  Inspection info:There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion).</p>
  
  <p>Screenshot: 
  <a href="https://imgur.com/a/4C2Sxg3" rel="nofollow noreferrer">https://imgur.com/a/4C2Sxg3</a></p>
  
  <p>I have tried the following:</p>
  
  <p><a href="https://stackoverflow.com/questions/42374151/all-com-android-support-libraries-must-use-the-exact-same-version-specification">All com.android.support libraries must use the exact same version specification</a></p>
  
  <p><a href="https://stackoverflow.com/questions/55556566/all-com-android-support-libraries-must-use-the-exact-same-version-specification">All com.android.support libraries must use the exact same version specification (mixing version can lead to runtime crashes)</a></p>
  
  <p>build.gradle:</p>
  
  <pre><code>dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  implementation 'com.android.support.constraint:constraint-layout:1.1.3'
  implementation 'com.google.firebase:firebase-auth:16.0.3'
  implementation 'com.google.firebase:firebase-core:16.0.3'
  testImplementation 'junit:junit:4.12'
  implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
  androidTestImplementation 'com.android.support.test:runner:1.0.2'
  androidTestImplementation 'com.android.support.test.espresso:espresso core:3.0.2' }
  </code></pre>