title: How to fix "plugin was not found in any of the following sources"
body: <p>I created a Spring MVC project ion Intellij IDEA. When I build my project, following message is displayed, how can I resolve it?</p>
  <pre><code>Plugin [id: 'org.springframework.boot', version: '2.1.7.RELEASE'] was not found in any of the following sources:
  
  - Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
  - Plugin Repositories (could not resolve plugin artifact 'org.springframework.boot:org.springframework.boot.gradle.plugin:2.1.7.RELEASE')
    Searched in the following repositories:
      Gradle Central Plugin Repository
  </code></pre>