title: Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ.
body: <p>I am new to Android App Development. When I tried to create a new project,Android Project...the following message popped up..</p>
  
  <p>Error:Execution failed for task ':app:preDebugAndroidTestBuild'.</p>
  
  <blockquote>
    <p>Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See <a href="https://d.android.com/r/tools/test-apk-dependency-conflicts.html" rel="noreferrer">https://d.android.com/r/tools/test-apk-dependency-conflicts.html</a> for details.
    Information:Gradle tasks [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar]</p>
  </blockquote>
  
  <p>This is the screenshot of my project
  <a href="https://i.stack.imgur.com/JrhHw.png" rel="noreferrer">click here to see screenshot of the error i got</a></p>
  
  <p>i also tried adding this code to my dependency..
  androidTestCompile 'com.android.support:support-annotations:23.3.0'
  this didn't work out. I also tried 27.1.1 and 26.1.0..
  that didn't work out either.</p>