Hello francot514, it doesn't work because the physics implementation was never finished, it also appears some of the functions have changed since I wrote the original implementation for ENIGMA. We also offer our own physics implementation of Box2D that gives you more control over the engine.
http://enigma-dev.org/docs/Wiki/Box2D_FunctionsThe following AI Tutorial also works perfectly on the latest version. You'll need my alarm fixes though, to get them you just open enigma-dev/git-bash.exe and enter the following:
cd enigma-dev
git fetch
git pull
https://www.dropbox.com/s/bkmtmx4kcggddjm/AItutorial.gmx.zip?dl=0