[boost] Attempting to build doc for sandbox project failure

I have setup BoostBook on my system following the instructions at Boost in the BoostBook documentation. I attempted to generate documentation for one of the sandbox projects, going to the dandbox project's libs/doc directory and executing bjam --v2 there. I received a message saying that "error: Did not find Jamfile or project-root.jam in any parent directory." But I can clearly see a Jamfile in the sandboxes root directory. Does anybod have any idea what has gone wrong ?