反向推进ORM导致'Buildfile:/ build.xml不存在'

When calling the following command from within a folder with build.properties file in it

# ../propel/generator/bin/propel-gen . reverse

I get

Buildfile: /build.xml does not exist!

Is this because I calling the propel-gen file incorrectly as it should be in my PATH?

Or is there another reason?

I didn't think that using reverse even needed a build.xml file?

Everything needs a build.xml file as it's how Phing works. But, it should be auto discovered in .../propel/generator. This issue is known and has been fixed in Propel after 1.6.7.