Invalid file name error in eclipse for images
<p>I'm facing the following error:</p>

<pre><code>res/drawable-hdpi/Twitter.png: Invalid file name: must contain only [a-z0-9_.]
</code></pre>

<p>Twitter.png looks like a valid filename to me. None of the other images having names like Facebook.png, RSS.png work. </p>

<p>Help please!!</p>
