Thanks for pointing this out. It looks like there's a minor coding issue in our XML file. Can you edit the /modules/mod_sendy/mod_sendy.xml file. Around line 11, you'll see:
<description>
<![CDATA[LOTS OF STUFF HERE]]>
</description>
Delete that <![CDATA .. line entirely. There's an open div in there that needs to be closed but, for now, it's simpler to just remove it entirely.
Let us know if that helps and, if so, we'll release an updated package.
Thanks,
Alex