title: How to see dependency tree in sbt?
body: <p>I am trying to inspect the SBT dependency tree as described in the <a href="http://www.scala-sbt.org/0.13.2/docs/Howto/inspect.html#taskdependencytree" rel="noreferrer">documentation</a>:</p>
  
  <pre><code>sbt inspect tree clean
  </code></pre>
  
  <p>But I get this error:</p>
  
  <pre><code>[error] inspect usage:
  [error]   inspect [uses|tree|definitions] &lt;key&gt;   Prints the value for 'key', the defining scope, delegates, related definitions, and dependencies.
  [error]
  [error] inspect
  [error]        ^
  </code></pre>
  
  <p>What is wrong? Why doesn't SBT build the tree?</p>