[Plugin: HTML5 Stylish CHAT, RumbleTalk (FREE)] Parse error: syntax error, unexpected $end

Sorry, it was an upgrade error , we added features that resulted in that error.

The error is caused by the use of short PHP tags – <? instead of <?php.
There are two ways to fix it:

open rumbletalk-chat.php and change all the occurrences of <? to <?php

OR you can edit your php.ini tag and set short_open_tag = on