couldn't install sonata admin bundle
<p>while installing admin bundle through this error : </p>

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<pre class="snippet-code-html lang-html prettyprint-override"><code>Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - sonata-project/admin-bundle 2.3.7 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.6 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.5 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.4 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.3 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.2 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.1 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - sonata-project/admin-bundle 2.3.0 requires sensio/generator-bundle ~2.3 -&gt; no matching package found.
    - Installation request for sonata-project/admin-bundle ^2.3 -&gt; satisfiable by sonata-project/admin-bundle[2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see &lt;https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion&gt; for more details.

Read &lt;https://getcomposer.org/doc/articles/troubleshooting.md&gt; for further common problems.</code></pre>
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however I have installed sensio/generator-bundle
what is the problem ? and how I can fix that ? </p>

<p>my symfony is 3.0.1 </p>