title: Error:Timeout waiting to lock buildscript class cache for build file when change minSdkVersion
body: <p>I try to change <code>minSdkVersion</code> in <code>build.gradle</code> (Module: app) in <code>Android Studio</code> and get next error:</p>
  
  <pre><code>Error:Timeout waiting to lock buildscript class cache for build file 'E:\pathtoproject\app\build.gradle' (C:\Users\Administrator\.gradle\caches\2.2.1\scripts\build_f00bwdji3qxl7urq5chsbakgv\ProjectScript\buildscript). It is currently in use by another Gradle instance.
  Owner PID: unknown
  Our PID: 4592
  Owner Operation: unknown
  Our operation: Initialize cache
  Lock file: C:\Users\Administrator\.gradle\caches\2.2.1\scripts\build_f00bwdji3qxl7urq5chsbakgv\ProjectScript\buildscript\cache.properties.lock
  </code></pre>
  
  <p><strong>What is it error? How to change <code>minSdkVersion</code> ?</strong></p>