title: Trying to start Grakn but getting a Java error
body: <p>I'm trying to start Grakn with <code>./grakn server start</code> in the console. I'm in the <code>grakn</code> directory but I'm getting the error below:</p>
  
  <pre><code>An error has occurred during boot-up. Please run 'grakn server status' or check the logs located under the 'logs' directory.
  Unsupported Java version [11] found. Grakn needs Java 1.8 in order to run.
  </code></pre>