OM SVN CHECKOUT - BUILD FAIL NO BUILD.XML FILE

[Mark Lin]

Hello,

svn checkout
https://svn.apache.org/repos/asf/openmeetings/trunk/singlewebapp/

cd :/usr/adm/singlewebapp

/usr/adm/apache-ant-1.9.0/bin/ant clean.all
Buildfile: build.xml does not exist!
Build failed


what i'm doing wrong?

Thank  you