title: compile: version "go1.9" does not match go tool version "go1.9.1"
body: <p>I am getting this error when I tried to run an example helloworld code I got onlie.</p>
  
  <pre><code>compile: version "go1.9" does not match go tool version "go1.9.1"
  </code></pre>
  
  <p>My computer has go1.9.1. What does the error mean and how can I fix this?</p>