Doctrine 2.0 mini tutorial error - The 'class-dir' argument is required for this driver

I am getting

orm:schema-tool => Th开发者_Go百科e supplied configuration uses the annotation metadata driver. The 'class-dir' argument is required for this driver.

When I try to follow the Doctrine 2.0 alpha (I know it's alpha) mini tutorial

I am on Windows 7 x64, wamp 2. I ran

php.exe doctrine.php orm:schema-tool --create

From within the same directory:

php.exe doctrine orm:schema-tool --create --class-dir=./Entities