This is not a game support forum, you are basically asking your question at the wrong place. The pop-up message is misleading you a little I think.
Ogre3D is a graphics rendering engine and this forum is for software developers who use Ogre3D in their products.
The book of unwritten tales clearly being one product which uses Ogre3D as its rendering engine.
I think maybe if you look around here at this forum a little bit, you will probably find some people who are the developers of that game, and they would probably be able to help you.
In fact I will help you. Here viewtopic.php?f=11&t=43388
is a "showcase" thread for The book of unwritten tales. You can see there the developers of the game, contact them.
Usually when you have a problem with a game then the first contact point for you is the publisher
of the game though.