title: ext.kotlin_version = <'latest version'> error on Flutter
body: <p>I am trying to place advertising in my flutter app, this is proving to be almost more complicated for me than creating the app itself (I am a newbie dev starting with flutter).</p>
  <p>I get an error when I try to launch my app that says the following: [!] Your project requires a newer version of the Kotlin Gradle plugin. Find the latest version on <a href="https://kotlinlang.org/docs/gradle.html#plugin-and-versions" rel="noreferrer">https://kotlinlang.org/docs/gradle.html#plugin-and-versions</a>, then update C:\Users\User\Desktop\Dev\adtest\android\build.gradle: ext.kotlin_version = '' Exception: Gradle task assembleDebug failed with exit code 1</p>
  <p>The problem seems simple, I have to update the field suggested by the console. My surprise is that the field ext.kotlin_version = &quot; &quot;, does not exist in my build.grade file on android/build.gradle. Neither does the buildscript { } apatagate exist that should contain it. I have android Studio installed, Flutter updated, I work with visual studio code, everything is apparently correct, except for this.</p>
  <p>Thanks for your help.</p>