title: How can I resolve "adb server is out of date" error
body: <p>I understand that this question has been asked 1000 times but every answer I can find on Stackoverflow and other websites are all the same: Either (1) The user is using Genymotion, (2) the user is using HTC Sync in Windows.</p>
  
  <p>I am doing neither. I am currently running in OS/X (10.11.6) and am using a Moto X (2nd gen) phone running Android 6.0.</p>
  
  <p>Many times (not every time) when I run "adb logcat", I get </p>
  
  <pre><code>adb server is out of date.  killing...
  * daemon started successfully *
  </code></pre>
  
  <p>This is a problem because I am trying to run some automated tests using gradlew (since using "adb shell am instrument" doesn't produce the JUnit style report I need) and collect logs... but every time I start "adb logcat", something in gradlew (apparently) tries to startup adb, which then kills <em>all</em> running instances of adb.</p>
  
  <p>Has anyone seen this problem <em>without</em> using Genymotion/HTCSync/Windows and knows a solution?</p>
  
  <p>Thanks!</p>