title: Apache zeppelin tutorial, error "sql interpreter not found"
body: <p>In the "<em>Zeppelin tutorial</em>" notebook, I can't use the <strong>%sql interpreter</strong>. It will output "<code>sql interpreter not found</code>". But the spark commands work fine, as well as <code>%md</code> and <code>%sh</code>.</p>
  
  <p>Here's the log :</p>
  
  <blockquote>
    <p>ERROR [2015-10-20 10:13:35,045] ({qtp885851948-51} NotebookServer.java[runParagraph]:615) - Exception from run
    org.apache.zeppelin.interpreter.InterpreterException: sql interpreter not found
            at org.apache.zeppelin.notebook.NoteInterpreterLoader.get(NoteInterpreterLoader.java:148)
            at org.apache.zeppelin.notebook.Note.run(Note.java:282)
            at org.apache.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:613)
            at org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:126)
            at org.apache.zeppelin.socket.NotebookSocket.onMessage(NotebookSocket.java:56)
            at org.eclipse.jetty.websocket.WebSocketConnectionRFC6455$WSFrameHandler.onFrame(WebSocketConnectionRFC6455.java:835)
            at org.eclipse.jetty.websocket.WebSocketParserRFC6455.parseNext(WebSocketParserRFC6455.java:349)
            at org.eclipse.jetty.websocket.WebSocketConnectionRFC6455.handle(WebSocketConnectionRFC6455.java:225)
            at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
            at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
            at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
            at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
            at java.lang.Thread.run(Thread.java:745)</p>
  </blockquote>